Merge branch '39111-remove-n-shortcut' into 'master'

Remove global dropdown shortcut from help modal

Closes #39111

See merge request gitlab-org/gitlab-ce!14876

app/views/help/_shortcuts.html.haml

@@ -15,10 +15,6 @@
                 %tr
                   %th
                   %th Global Shortcuts
-                %tr
-                  %td.shortcut
-                    .key n
-                  %td Main Navigation
                 %tr
                   %td.shortcut
                     .key s