Add DIAGNOSTICS section name

usr.bin/sed/sed.1

@@ -59,7 +59,7 @@ are specified, modifying the input as specified by a list of commands.
 The input is then written to the standard output.
 .Pp
 A single command may be specified as the first argument to
-.Nm sed .
+.Nm Ns .
 Multiple commands may be specified by using the
 .Fl e
 or
@@ -506,10 +506,10 @@ This is the same as specifying the
 .Fl n
 option on the command line.
 .El
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
-utility exits 0 on success and >0 if an error occurs.
+utility exits 0 on success, and >0 if an error occurs.
 .Sh SEE ALSO
 .Xr awk 1 ,
 .Xr ed 1 ,

usr.bin/tail/tail.1

@@ -140,7 +140,7 @@ header consisting of the string
 where
 .Dq XXX
 is the name of the file.
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
 utility exits 0 on success, and >0 if an error occurs.

usr.bin/tee/tee.1

@@ -76,13 +76,13 @@ utility takes the default action for all signals,
 except in the event of the
 .Fl i
 option.
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
 utility exits 0 on success, and >0 if an error occurs.
 .Sh STANDARDS
 The
 .Nm
-function is expected to be
+utility is expected to be
 .St -p1003.2
 compatible.

usr.bin/touch/touch.1

@@ -123,7 +123,7 @@ If the
 .Dq SS
 letter pair is not specified, the value defaults to 0.
 .El
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
 utility exits 0 on success, and >0 if an error occurs.

usr.bin/tr/tr.1

@@ -228,7 +228,7 @@ If
 has a leading zero, it is interpreted as an octal value, otherwise,
 it's interpreted as a decimal value.
 .El
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
 utility exits 0 on success, and >0 if an error occurs.

usr.bin/uniq/uniq.1

@@ -114,7 +114,7 @@ Case insensitive comparison of lines.
 If additional arguments are specified on the command line, the first
 argument is used as the name of an input file, the second is used
 as the name of an output file.
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
 utility exits 0 on success, and >0 if an error occurs.

usr.bin/wc/wc.1

@@ -83,7 +83,7 @@ The default action is equivalent to specifying all of the flags.
 .Pp
 If no files are specified, the standard input is used and no
 file name is displayed.
-.Pp
+.Sh DIAGNOSTICS
 The
 .Nm
 utility exits 0 on success, and >0 if an error occurs.

usr.bin/xinstall/install.1

@@ -153,9 +153,10 @@ utility attempts to prevent moving a file onto itself.
 Installing
 .Pa /dev/null
 creates an empty file.
-.Pp
-Upon successful completion a value of 0 is returned.
-Otherwise, a value of 1 is returned.
+.Sh DIAGNOSTICS
+The
+.Nm
+utility exits 0 on success, and 1 otherwise.
 .Sh FILES
 .Bl -tag -width INS@XXXX -compact
 .It Pa INS@XXXX