* doc/emacs/glossary.texi (Glossary): Add "Tag" to the Glossary.
* doc/emacs/maintaining.texi (Xref): Mention that identifiers are
also known as "tags".
* lisp/replace.el (read-regexp, read-regexp-suggestions): Improve
wording of doc strings. (Bug#46088) (Bug#46089)
(cherry picked from commit 49eb03d6c8)