mdocml: Tweak the wording to avoid the possible misunderstanding that

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Tweak the wording to avoid the possible misunderstanding that .In
could only be used in the SYNOPSIS section.  It is fine anywhere.
Issue noticed by bentley@.

Modified Files:
--------------
    mdocml:
        mdoc.7

Revision Data
-------------
Index: mdoc.7
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mdoc.7,v
retrieving revision 1.250
retrieving revision 1.251
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.250 -r1.251
--- mdoc.7
+++ mdoc.7
@@ -1758,17 +1758,18 @@ is preferred for displaying code; the
 .Sx \&Ic
 macro is used when referring to specific instructions.
 .Ss \&In
-An
-.Dq include
-file.
+The name of an include file.
+This macro is most often used in section 2, 3, and 9 manual pages.
+.Pp
 When invoked as the first macro on an input line in the
 .Em SYNOPSIS
 section, the argument is displayed in angle brackets
 and preceded by
-.Dq #include ,
+.Qq #include ,
 and a blank line is inserted in front if there is a preceding
 function declaration.
-This is most often used in section 2, 3, and 9 manual pages.
+In other sections, it only encloses its argument in angle brackets
+and causes no line break.
 .Pp
 Examples:
 .Dl \&.In sys/types.h
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