Update Support/get-help links in ? nav menu

In gitlab-com/www-gitlab-com!118135
we recently removed the old getting-help redirect.
Instead of reverting that, this commit makes the in-app link match.

app/helpers/application_helper.rb

@@ -232,7 +232,7 @@ def promo_url
   end
 
   def support_url
-    Gitlab::CurrentSettings.current_application_settings.help_page_support_url.presence || "#{promo_url}/getting-help/"
+    Gitlab::CurrentSettings.current_application_settings.help_page_support_url.presence || "#{promo_url}/get-help/"
   end
 
   def instance_review_permitted?

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

@@ -12,7 +12,7 @@
       = f.gitlab_ui_checkbox_component :help_page_hide_commercial_content, _('Hide marketing-related entries from the Help page')
     .form-group
       = f.label :help_page_support_url, _('Support page URL'), class: 'label-bold'
-      = f.text_field :help_page_support_url, class: 'form-control gl-form-input', placeholder: 'https://company.example.com/getting-help', :'aria-describedby' => 'support_help_block'
+      = f.text_field :help_page_support_url, class: 'form-control gl-form-input', placeholder: 'https://company.example.com/get-help', :'aria-describedby' => 'support_help_block'
       %span.form-text.text-muted#support_help_block= _('Alternate support URL for Help page and Help dropdown.')
 
     .form-group

spec/features/admin/admin_settings_spec.rb

@@ -861,7 +861,7 @@
 
     context 'Nav bar' do
       it 'shows default help links in nav' do
-        default_support_url = "https://#{ApplicationHelper.promo_host}/getting-help/"
+        default_support_url = "https://#{ApplicationHelper.promo_host}/get-help/"
 
         visit root_dashboard_path
 

spec/helpers/application_helper_spec.rb

@@ -211,7 +211,7 @@ def element(**arguments)
 
   describe '#support_url' do
     context 'when alternate support url is specified' do
-      let(:alternate_url) { 'http://company.example.com/getting-help' }
+      let(:alternate_url) { 'http://company.example.com/get-help' }
 
       it 'returns the alternate support url' do
         stub_application_setting(help_page_support_url: alternate_url)
@@ -222,7 +222,7 @@ def element(**arguments)
 
     context 'when alternate support url is not specified' do
       it 'builds the support url from the promo_url' do
-        expect(helper.support_url).to eq(helper.promo_url + '/getting-help/')
+        expect(helper.support_url).to eq(helper.promo_url + '/get-help/')
       end
     end
   end