use sentence case for "Merge request events"

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

@@ -42,7 +42,7 @@
       = form.check_box :merge_requests_events, class: 'pull-left'
       .prepend-left-20
         = form.label :merge_requests_events, class: 'list-label' do
-          %strong Merge Request events
+          %strong Merge request events
         %p.light
           This URL will be triggered when a merge request is created/updated/merged
 .form-group

app/views/shared/web_hooks/_form.html.haml

@@ -50,7 +50,7 @@
       = form.check_box :merge_requests_events, class: 'pull-left'
       .prepend-left-20
         = form.label :merge_requests_events, class: 'list-label' do
-          %strong Merge Request events
+          %strong Merge request events
         %p.light
           This URL will be triggered when a merge request is created/updated/merged
     %li

doc/workflow/notifications.md

@@ -65,7 +65,7 @@ Below is the table of events users can be notified of:
 | Group access level changed   | User                                                              | Sent when user group access level is changed |
 | Project moved                | Project members [1]                                               | [1] not disabled |
 
-### Issue / Merge Request events
+### Issue / Merge request events
 
 In all of the below cases, the notification will be sent to:
 - Participants:

spec/features/admin/admin_hooks_spec.rb

@@ -105,7 +105,7 @@ describe 'Admin::Hooks' do
 
         fill_in 'hook_url', with: url
         uncheck 'Repository update events'
-        check 'Merge Request events'
+        check 'Merge request events'
 
         expect { click_button 'Add system hook' }.to change(SystemHook, :count).by(1)
         expect(current_path).to eq(admin_hooks_path)