Exposed 'onToggleHelp() to window object so showHelp() can be a global function'

Removed from window and used static method

app/assets/javascripts/shortcuts.js.coffee

@@ -9,12 +9,12 @@ class @Shortcuts
   onToggleHelp: (e) =>
     e.preventDefault()
-    @toggleHelp(@enabledHelp)
-  toggleMarkdownPreview: (e) =>
+    Shortcuts.toggleHelp(@enabledHelp)
+  toggleMarkdownPreview: (e) ->
     $(document).triggerHandler('markdown-preview:toggle', [e])
-  toggleHelp: (location) ->
+  @toggleHelp: (location) ->
     $modal = $('#modal-shortcuts')
     if $modal.length

app/views/help/index.html.haml

@@ -36,6 +36,6 @@
       %ul.well-list
         %li= link_to 'See our website for getting help', promo_url + '/getting-help/'
         %li= link_to 'Use the search bar on the top of this page', '#', onclick: 'Shortcuts.focusSearch(event)'
-        %li= link_to 'Use shortcuts', '#', onclick: 'Shortcuts.showHelp(event)'
+        %li= link_to 'Use shortcuts', '#', onclick: 'Shortcuts.toggleHelp()'
         %li= link_to 'Get a support subscription', 'https://about.gitlab.com/pricing/'
         %li= link_to 'Compare GitLab editions', 'https://about.gitlab.com/features/#compare'