Update gitaly.md

doc/development/gitaly.md

@@ -89,9 +89,11 @@ can be tested against. This requires the `:request_store` flag to be set.
 
 ```ruby
 describe 'Gitaly Request count tests' do
+  context 'when the request store is activated', :request_store do
     it 'correctly counts the gitaly requests made' do
       expect { subject }.to change { Gitlab::GitalyClient.get_request_count }.by(10)
     end
+  end
 end
 ```