update application setting label for shared_runners_minutes

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

@@ -216,11 +216,11 @@
             = f.check_box :shared_runners_enabled
             Enable shared runners for new projects
     .form-group
-      = f.label :shared_runners_minutes, 'Shared runners minutes', class: 'control-label col-sm-2'
+      = f.label :shared_runners_minutes, 'Build minutes quota', class: 'control-label col-sm-2'
       .col-sm-10
         = f.number_field :shared_runners_minutes, class: 'form-control'
         .help-block
-          Set the maximum amount of minutes that project can use shared runners in period of time
+          Set the maximum number of minutes that a group can use shared runners in a one month period
           = link_to "(?)", help_page_path("user/admin_area/settings/continuous_integration", anchor: "shared-runners-minutes")
     .form-group
       = f.label :shared_runners_text, class: 'control-label col-sm-2'