Update spec comment to point to correct issue

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -779,7 +779,7 @@ describe Projects::MergeRequestsController do
       end
 
       # we're trying to reduce the overall number of queries for this method.
-      # set a hard limit for now. https://gitlab.com/gitlab-org/gitlab-ce/issues/43109
+      # set a hard limit for now. https://gitlab.com/gitlab-org/gitlab-ce/issues/52287
       it 'keeps queries in check' do
         control_count = ActiveRecord::QueryRecorder.new { get_ci_environments_status }.count