Add help link to protected paths settings

It wasn't clear to me that this is only for POST requests.

app/views/admin/application_settings/network.html.haml

@@ -43,6 +43,10 @@
       = expanded_by_default? ? _('Collapse') : _('Expand')
     %p
       = _('Configure paths to be protected by Rack Attack.')
+      .help-block
+        = _('These paths are protected for POST requests.')
+        = link_to _('More information'), help_page_path('security/rack_attack', anchor: 'protected-paths-throttle'), target: '_blank'
+
   .settings-content
     = render 'protected_paths'
 

locale/gitlab.pot

@@ -26951,6 +26951,9 @@ msgstr ""
 msgid "These existing issues have a similar title. It might be better to comment there instead of creating another similar issue."
 msgstr ""
 
+msgid "These paths are protected for POST requests."
+msgstr ""
+
 msgid "These variables are configured in the parent group settings, and will be active in the current project in addition to the project variables."
 msgstr ""