More updates to Maintaining chapter of Emacs manual.
* files.texi (Misc File Ops): Mention vc-delete-file. * maintaining.texi (Tags): Mention Semantic. (Create Tags Table, Etags Regexps): Copyedits. (Find Tag): Mention minibuffer completion. (List Tags): Mention completion-at-point. Completion is actually available in M-x list-tags. * programs.texi (Symbol Completion): Mention completion-at-point explicitly. * vc1-xtra.texi (VC Delete/Rename): Rename from Renaming and VC. Document vc-delete-file.
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