Merge branch 'jp/completion-help-alias'

* jp/completion-help-alias:
  git-completion: Add git help completion for aliases

contrib/completion/git-completion.bash

@@ -1511,7 +1511,7 @@ _git_help ()
 		;;
 	esac
 	__git_compute_all_commands
-	__gitcomp "$__git_all_commands
+	__gitcomp "$__git_all_commands $(__git_aliases)
 		attributes cli core-tutorial cvs-migration
 		diffcore gitk glossary hooks ignore modules
 		repository-layout tutorial tutorial-2