Fix duplicate spec in closing issue specs

.rubocop.yml

@@ -395,7 +395,6 @@ RSpec/RepeatedExample:
     - 'spec/frontend/fixtures/merge_requests.rb'
     - 'spec/graphql/gitlab_schema_spec.rb'
     - 'spec/helpers/users_helper_spec.rb'
-    - 'spec/lib/gitlab/closing_issue_extractor_spec.rb'
     - 'spec/lib/gitlab/import_export/project/relation_factory_spec.rb'
     - 'spec/rubocop/cop/migration/update_large_table_spec.rb'
     - 'spec/services/notification_service_spec.rb'

changelogs/unreleased/closing-issue-spec.yml

+---
+title: Remove duplicate spec from closing issue spec
+merge_request: 28803
+author: Rajendra Kadam
+type: added

spec/lib/gitlab/closing_issue_extractor_spec.rb

@@ -103,7 +103,7 @@ describe Gitlab::ClosingIssueExtractor do
       end
 
       it do
-        message = "Awesome commit (Fixes: #{reference})"
+        message = "Awesome commit (fixes: #{reference})"
         expect(subject.closed_by_message(message)).to eq([issue])
       end
 
@@ -396,7 +396,7 @@ describe Gitlab::ClosingIssueExtractor do
       end
 
       it 'allows mixed comma-separated and non-comma-separated issue numbers in single line message' do
-        message = "Closes #{reference}, #{reference2} and #{reference3}"
+        message = "Closes #{reference}, #{reference2} #{reference3}"
 
         expect(subject.closed_by_message(message))
             .to match_array([issue, other_issue, third_issue])