mdocml: Mention that the first argument of .Pf does not need escaping.

mdocml: Mention that the first argument of .Pf does not need escaping.

[schwarze]

Log Message:
-----------
Mention that the first argument of .Pf does not need escaping.
While here, make the first sentence regarding .Pf more concise.
OK jmc@

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

Revision Data
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Index: mdoc.7
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mdoc.7,v
retrieving revision 1.255
retrieving revision 1.256
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.255 -r1.256
--- mdoc.7
+++ mdoc.7
@@ -2155,19 +2155,23 @@ See also
 Close parenthesised context opened by
 .Sx \&Po .
 .Ss \&Pf
-Removes the space between its argument
-.Pq Dq prefix
-and the following macro.
+Removes the space between its argument and the following macro.
 Its syntax is as follows:
 .Pp
 .D1 .Pf Ar prefix macro arguments ...
 .Pp
 This is equivalent to:
 .Pp
-.D1 .No Ar prefix No \&Ns Ar macro arguments ...
+.D1 .No \e& Ns Ar prefix No \&Ns Ar macro arguments ...
+.Pp
+The
+.Ar prefix
+argument is not parsed for macro names or delimiters,
+but used verbatim as if it were escaped.
 .Pp
 Examples:
 .Dl ".Pf $ Ar variable_name"
+.Dl ".Pf . Ar macro_name"
 .Dl ".Pf 0x Ar hex_digits"
 .Pp
 See also
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