"regexp" in Emacs manual menus

[Kevin Rodgers]

There are lots of nodes in the Emacs manual with "regexp" in their name,
which is a good abbreviation.  But the description of those nodes in
Info menus should always spell out "regular expression" for novice
users.  For example, this is good:

* Regexps::                Syntax of regular expressions.

But this is bad:

* Regexp Search::          Search for match for a regexp.

--
Kevin