Document VC headers and other VC changes.
* maintaining.texi (Version Control): Say "commit", not "check in". (Version Control Systems): Simplify descriptions. (VCS Merging, VCS Changesets, VCS Repositories): New nodes, split from VCS Concepts. (VC Mode Line): Update example. (Old Revisions): Document revert-buffer for vc-diff. (Log Buffer): Promote to a subsection. Document header lines. * emacs.texi (Top): Update node listing.
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