formatted lerna completion and used helper function

completion/available/lerna.completion.bash

@@ -1,19 +1,21 @@
-#!/bin/bash
-# Lerna autocompletion.
-function _lerna_completions() {
-  local cur compls
+# shellcheck shell=bash
+cite "about-completion"
+about-completion "lerna(javascript project manager tool) completion"
 
-  # The currently-being-completed word.
-  cur="${COMP_WORDS[COMP_CWORD]}"
+function __lerna_completion() {
+	local cur compls
 
-  # Options
-  compls="add bootstrap changed clean create diff exec \
-          import init link list publish run version    \
-           --loglevel --concurrency --reject-cycles    \
-           --progress --sort --no-sort --help          \
-           --version"
+	# The currently-being-completed word.
+	cur="${COMP_WORDS[COMP_CWORD]}"
 
-  # Tell complete what stuff to show.
-  COMPREPLY=($(compgen -W "$compls" -- "$cur"))
+	# Options
+	compls="add bootstrap changed clean create diff exec \
+	import init link list publish run version    \
+	--loglevel --concurrency --reject-cycles    \
+	--progress --sort --no-sort --help          \
+	--version"
+
+	# Tell complete what stuff to show.
+	COMPREPLY=($(compgen -W "$compls" -- "$cur"))
 }
-complete -o default -F _lerna_completions lerna
+complete -o default -F __lerna_completion lerna