More updates for VC documentation.
* doc/emacs/maintaining.texi (VCS Concepts): Make "revision" terminology less CVS-specific. (VC With A Merging VCS, VC With A Locking VCS): Add xref to Registering node. (Secondary VC Commands): Deleted. Promote subnodes. (Log Buffer): Add command name for C-c C-c. Fix the name of the log buffer. Add index entries. (VCS Changesets, Types of Log File, VC With A Merging VCS): Use "commit" terminology. (Old Revisions): Move it to just before VC Change Log. "Tag" here doesn't refer to tags tables. Note other possible forms of the revision ID. C-x v = does not save. (Registering): Note similarity to C-x v v action. Fix description of how backends are chosen. De-document vc-default-init-revision. (VC Change Log): Document C-x v l in VC-Dir buffer. Document RET in root log buffers. * lisp/vc/vc.el (vc-deduce-fileset): Minor doc fix.
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