Merge branch 'fix-doc-link' into 'master'

Use direct link rather than redirect for the 2F2 documentation page

See merge request gitlab-org/gitlab-ce!18273

app/views/profiles/two_factor_auths/show.html.haml

@@ -20,7 +20,7 @@
       - else
         %p
           Download the Google Authenticator application from App Store or Google Play Store and scan this code.
-          More information is available in the #{link_to('documentation', help_page_path('profile/two_factor_authentication'))}.
+          More information is available in the #{link_to('documentation', help_page_path('user/profile/account/two_factor_authentication'))}.
         .row.append-bottom-10
           .col-md-4
             = raw @qr_code