Update AI generated MR text

This AI generated MR corresponds with the resolve with AI feature.
This updates the text description of the generated MR.
Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/434887

ee/app/views/vulnerabilities/merge_request_description.md.erb

 <% if llm_patch.present? %>
 ## AI GENERATED PATCH
 
-The suggested code changes in this MR were produced by using the GitLab Duo Resolve this vulnerability feature, using AI. Before you apply the code changes, carefully review and test them, to ensure that they solve the vulnerability, don't harm the functional behaviour of your application or introduce new vulnerabilities.
+The suggested code changes were generated by GitLab Duo Vulnerability resolution, an AI feature. Before you apply the code changes, carefully review and test them, to ensure that they solve the vulnerability, don't harm the functional behaviour of your application or introduce new vulnerabilities.
 
 The large language model that generated the suggested code changes was only provided with the affected lines of code, and the vulnerability in that code. It is not aware of any functionality outside of this context.
 

ee/spec/services/merge_requests/create_from_vulnerability_data_service_spec.rb

@@ -322,7 +322,7 @@
         <<~DESC.chomp
           ## AI GENERATED PATCH
 
-          The suggested code changes in this MR were produced by using the GitLab Duo Resolve this vulnerability feature, using AI. Before you apply the code changes, carefully review and test them, to ensure that they solve the vulnerability, don't harm the functional behaviour of your application or introduce new vulnerabilities.
+          The suggested code changes were generated by GitLab Duo Vulnerability resolution, an AI feature. Before you apply the code changes, carefully review and test them, to ensure that they solve the vulnerability, don't harm the functional behaviour of your application or introduce new vulnerabilities.
 
           The large language model that generated the suggested code changes was only provided with the affected lines of code, and the vulnerability in that code. It is not aware of any functionality outside of this context.