More updates for VC documentation.
* doc/emacs/maintaining.texi (VCS Merging, VCS Changesets): Index entries. (VC Mode Line): Add index entry for "version control status". (VC Undo): Use vc-revert instead of its vc-revert-buffer alias. Document vc-revert-show-diff. De-document vc-rollback. (VC Directory Mode): Rewrite introduction. Move prefix arg documentation here from VC Directory Buffer node. (VC Directory Buffer): Use a decentralized VCS example. (VC Directory Commands): Use a table. Remove material duplicated in previous nodes on multi-file VC filsets.
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