Add a paragraph which should clarify the separation of asterisks

and adjacent tokens in declarations.
The added text was originally a single sentence I wrote and which
was heavily modified and extended by Bruce Evans.

This clarification attempt originates from differing usage of the
'restrict' type-qualifier.
Although various documents documents dicussing the C Programming
Language put a space between an asterisk and the 'restrict' keyword,
including the C99 standard (at least the n869.txt draft) and other
ISO/IEC JTC1/SC22/WG14 documents, the IEEE Std 1003.1-2001 document
does not separate them.

Discussed with:		bde
Requested by:		tjr
Separation using a single space also liked by:	mike

share/man/man9/style.9

@@ -185,6 +185,12 @@ Enumeration values are all uppercase.
 enum enumtype { ONE, TWO } et;
 .Ed
 .Pp
+In declarations, do not put any whitespace between asterisks and
+adjacent tokens, except for tokens that are identifiers related to
+types.  (These identifiers are the names of basic types, type
+qualifiers, and typedef-names other than the one being declared.)
+Separate these identifers from asterisks using a single space.
+.Pp
 When declaring variables in structures, declare them sorted by use, then
 by size, and then in alphabetical order.
 The first category normally does not apply, but there are exceptions.