Fix typo in spec name

Co-authored-by: Spencer Transier <17955542+spencertransier@users.noreply.github.com>

Author: AliSoftware

spec/buildkite_annotate_action_spec.rb

@@ -71,7 +71,7 @@
   end
 
   describe 'annotation deletion' do
-    it 'generates the right command to delete an annotation with no message is provided' do
+    it 'generates the right command to delete an annotation when no message is provided' do
       cmd = run_described_fastlane_action(
         context: 'some ctx',
         message: nil