Major mode for editing Git log messages.
It is based on `log-edit-mode', and has Git-specific extensions.
In addition to any hooks its parent mode might have run,
this mode runs the hook `vc-git-log-edit-mode-hook', as the final step
during initialization.
key binding
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C-c Prefix Command
C-c C-e vc-git-log-edit-toggle-amend
C-c C-s vc-git-log-edit-toggle-signoff
(fn)