Better wording according to multibyte(3)

Better man formatting
Add reference to multibyte(3)

lib/libc/locale/isalnum.3

@@ -54,8 +54,13 @@ function tests for any character for which
 or
 .Xr isdigit 3
 is true.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -83,6 +88,7 @@ returns non-zero if the character tests true.
 .Xr ctype 3 ,
 .Xr isalpha 3 ,
 .Xr isdigit 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/isalpha.3

@@ -54,8 +54,13 @@ function tests for any character for which
 or
 .Xr islower 3
 is true.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -81,6 +86,7 @@ returns non-zero if the character tests true.
 .Xr ctype 3 ,
 .Xr islower 3 ,
 .Xr isupper 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/isblank.3

@@ -46,8 +46,13 @@
 The
 .Fn isblank
 function tests for a space or tab character.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 .Sh RETURN VALUES
 The
 .Fn isblank
@@ -55,4 +60,5 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7

lib/libc/locale/iscntrl.3

@@ -50,8 +50,13 @@
 The
 .Fn iscntrl
 function tests for any control character.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -71,6 +76,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/isdigit.3

@@ -50,8 +50,13 @@
 The
 .Fn isdigit
 function tests for any decimal-digit character.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -66,6 +71,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/isgraph.3

@@ -50,8 +50,13 @@
 The
 .Fn isgraph
 function tests for any printing character except space.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -83,6 +88,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/islower.3

@@ -50,8 +50,13 @@
 The
 .Fn islower
 function tests for any lower-case letters.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -70,6 +75,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr tolower 3 ,
 .Xr ascii 7
 .Sh STANDARDS

lib/libc/locale/isprint.3

@@ -50,8 +50,13 @@
 The
 .Fn isprint
 function tests for any printing character including space (' ').
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -83,6 +88,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/ispunct.3

@@ -53,8 +53,13 @@ function tests for any printing character except for space (' ') or a
 character for which
 .Xr isalnum 3
 is true.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -74,6 +79,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/isspace.3

@@ -50,8 +50,13 @@
 The
 .Fn isspace
 function tests for the standard white-space characters.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -66,6 +71,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The

lib/libc/locale/isupper.3

@@ -50,8 +50,13 @@
 The
 .Fn isupper
 function tests for any upper-case letter.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -70,6 +75,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr toupper 3 ,
 .Xr ascii 7
 .Sh STANDARDS

lib/libc/locale/isxdigit.3

@@ -50,8 +50,13 @@
 The
 .Fn isxdigit
 function tests for any hexadecimal-digit character.
-For 8-bit wide locales the value of the argument is
-representable as an unsigned char or the value of EOF.
+For single C
+.Va char Ns s
+locales the value of the argument is
+representable as an
+.Va unsigned char
+or the value of
+.Dv EOF .
 In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):
 .Pp
@@ -69,6 +74,7 @@ function returns zero if the character tests false and
 returns non-zero if the character tests true.
 .Sh SEE ALSO
 .Xr ctype 3 ,
+.Xr multibyte 3 ,
 .Xr ascii 7
 .Sh STANDARDS
 The