Fix RSpec/ContextWording offense

ee/spec/serializers/integrations/jira/issue_entity_spec.rb

@@ -130,7 +130,7 @@
     end
   end
-  context 'feature flag "jira_issues_show_integration" is disabled' do
+  context 'when feature flag "jira_issues_show_integration" is disabled' do
     before do
       stub_feature_flags(jira_issues_show_integration: false)
     end