mdocml: Add example of comments in man.7 and mdoc.7.

mdocml: Add example of comments in man.7 and mdoc.7.

[kristaps]

Log Message:
-----------
Add example of comments in man.7 and mdoc.7.

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

Revision Data
-------------
Index: man.7
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/man.7,v
retrieving revision 1.103
retrieving revision 1.104
diff -Lman.7 -Lman.7 -u -p -r1.103 -r1.104
--- man.7
+++ man.7
@@ -72,6 +72,14 @@ Furthermore,
 macro lines with only a control character and optional trailing
 whitespace are
 stripped from input.
+.Pp
+Examples:
+.Bd -literal -offset indent -compact
+\&.\e\*q This is a comment line.
+\&.\e\*q The next line is ignored:
+\&.
+\&.Em Emphasis \e\*q This is also a comment.
+.Ed
 .Ss Special Characters
 Special characters are used to encode special glyphs and are rendered
 differently across output media.
Index: mdoc.7
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc.7,v
retrieving revision 1.200
retrieving revision 1.201
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.200 -r1.201
--- mdoc.7
+++ mdoc.7
@@ -73,6 +73,14 @@ Furthermore,
 macro lines with only a control character and optional trailing
 whitespace are
 stripped from input.
+.Pp
+Examples:
+.Bd -literal -offset indent -compact
+\&.\e\*q This is a comment line.
+\&.\e\*q The next line is ignored:
+\&.
+\&.Em Emphasis \e\*q This is also a comment.
+.Ed
 .Ss Special Characters
 Special characters are used to encode special glyphs and are rendered
 differently across output media.
@@ -260,9 +268,9 @@ Examples:
 .It \&.Bl -tag -width 2i
 two-inch tagged list indentation
 .Pq see Sx \&Bl
-.It \&.br 2v
+.It \&.sp 2v
 two vertical spaces
-.Pq see Sx \&br
+.Pq see Sx \&sp
 .El
 .Ss Sentence Spacing
 Sentences should terminate at the end of an input line.
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