Clarify default message on double object

ee/app/serializers/integrations/jira/issue_entity.rb

@@ -74,6 +74,8 @@ module Integrations
 
       def author_web_url(jira_issue)
         # There are differences between Jira Cloud and Jira Server URLs and responses.
+        # accountId is only available on Jira Cloud.
+        # https://community.atlassian.com/t5/Jira-Questions/How-to-find-account-id-on-jira-on-premise/qaq-p/1168652
         if jira_issue.reporter.try(:accountId)
           "#{jira_issue.client.options[:site]}people/#{jira_issue.reporter.accountId}"
         else

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

@@ -8,7 +8,7 @@ RSpec.describe Integrations::Jira::IssueEntity do
   let(:reporter) do
     double(
       'displayName' => 'reporter',
-      'name' => double
+      'name' => double # Default to Jira Server issue response, Jira Cloud replaces name with accountId
     )
   end