mdoc: rendering fixes

svn path=/head/; revision=282007

lib/libc/regex/re_format.7

@@ -392,10 +392,12 @@ and
 .Ql ?\&
 are ordinary characters, and their functionality
 can be expressed using bounds
-.No ( Ql {1,}
+.Po
+.Ql {1,}
 or
 .Ql {0,1}
-respectively).
+respectively
+.Pc .
 Also note that
 .Ql x+
 in modern REs is equivalent to

lib/libc/regex/regex.3

@@ -420,10 +420,12 @@ it should have been the result from the most recent
 using that
 .Ft regex_t .
 The
-.Fn ( regerror
+.Po
+.Fn regerror
 may be able to supply a more detailed message using information
 from the
-.Ft regex_t . )
+.Ft regex_t .
+.Pc
 The
 .Fn regerror
 function