Merge branch 'du/rev-parse-is-plumbing' into maint

Doc update.

* du/rev-parse-is-plumbing:
  doc: move git-rev-parse from porcelain to plumbing

Author: gitster

command-list.txt

@@ -152,7 +152,7 @@ git-rerere                              ancillaryinterrogators
 git-reset                               mainporcelain           worktree
 git-revert                              mainporcelain
 git-rev-list                            plumbinginterrogators
-git-rev-parse                           ancillaryinterrogators
+git-rev-parse                           plumbinginterrogators
 git-rm                                  mainporcelain           worktree
 git-send-email                          foreignscminterface             complete
 git-send-pack                           synchingrepositories