Prefix random Markdown tips with "Tip:"

app/helpers/gitlab_markdown_helper.rb

@@ -118,7 +118,7 @@ module GitlabMarkdownHelper
 
   # Returns a random markdown tip for use as a textarea placeholder
   def random_markdown_tip
-    MARKDOWN_TIPS.sample
+    "Tip: #{MARKDOWN_TIPS.sample}"
   end
 
   private

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -137,7 +137,7 @@ describe GitlabMarkdownHelper do
   describe 'random_markdown_tip' do
     it 'returns a random Markdown tip' do
       stub_const("#{described_class}::MARKDOWN_TIPS", ['Random tip'])
-      expect(random_markdown_tip).to eq 'Random tip'
+      expect(random_markdown_tip).to eq 'Tip: Random tip'
     end
   end
 end