mandoc: clarify how .%P is conventionally used; triggered by a question

mandoc: clarify how .%P is conventionally used; triggered by a question

[schwarze]

Log Message:
-----------
clarify how .%P is conventionally used;
triggered by a question from Fabio Scotoni <fabio at esse dot ch>

Modified Files:
--------------
    mandoc:
        mdoc.7

Revision Data
-------------
Index: mdoc.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc.7,v
retrieving revision 1.276
retrieving revision 1.277
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.276 -r1.277
--- mdoc.7
+++ mdoc.7
@@ -596,6 +596,13 @@ block.
 Book or journal page number of an
 .Ic \&Rs
 block.
+Conventionally, the argument starts with
+.Ql p.\&
+for a single page or
+.Ql pp.\&
+for a range of pages, for example:
+.Pp
+.Dl .%P pp. 42\e(en47
 .It Ic \&%Q Ar name
 Institutional author (school, government, etc.) of an
 .Ic \&Rs
@@ -2969,7 +2976,7 @@ exclamation mark
 Note that even a period preceded by a backslash
 .Pq Sq \e.\&
 gets this special handling; use
-.Sq \e&.
+.Sq \e&.\&
 to prevent that.
 .Pp
 Many in-line macros interrupt their scope when they encounter
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