Markup fixes.

usr.bin/mkstr/mkstr.1

@@ -41,12 +41,12 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl
-.Ar messagefile
+.Ar mesgfile
 .Ar prefix Ar
 .Sh DESCRIPTION
 The
 .Nm
-utility creates files containing error messages extracted from C source,
+utility creates a file containing error messages extracted from C source,
 and restructures the same C source, to utilize the created error message
 file.
 The intent of
@@ -58,8 +58,7 @@ section below).
 .Pp
 The
 .Nm
-utility processes each of the specified
-.Ar files ,
+utility processes each of the specified files,
 placing a restructured version of the input in a file whose name
 consists of the specified
 .Ar prefix
@@ -76,7 +75,7 @@ files in the current directory to be placed in the file
 .Ar pistrings
 and restructured copies of the sources to be placed in
 files whose names are prefixed with
-.Ar \&xx .
+.Dq Li xx .
 .Pp
 Options:
 .Bl -tag -width indent
@@ -91,10 +90,10 @@ The
 .Nm
 utility finds error messages in the source by
 searching for the string
-.Li \&`error("'
+.Sq Li error("
 in the input stream.
 Each time it occurs, the C string starting at the
-.Sq \&"\&
+.Ql \&"
 is stored
 in the message file followed by a null character and a new-line character;
 The new source is restructured with