Merge branch 'jk/rebase-no-autostash' into maint

There was no way to defeat a configured rebase.autostash variable
from the command line, as "git rebase --no-autostash" was missing.

* jk/rebase-no-autostash:
  Documentation/git-rebase: fix --no-autostash formatting
  rebase: support --no-autostash

Documentation/git-rebase.txt

@@ -434,7 +434,8 @@ If the '--autosquash' option is enabled by default using the
 configuration variable `rebase.autoSquash`, this option can be
 used to override and disable this setting.
 
---[no-]autostash::
+--autostash::
+--no-autostash::
 	Automatically create a temporary stash before the operation
 	begins, and apply it after the operation ends.  This means
 	that you can run rebase on a dirty worktree.  However, use