Add L3-LMS WSDL to migration guide
Added WSDL URLs for L3 users to reference when migrating to the new Integration Service.
Improve security with one click by enabling Secret Push Protection for your projects: https://docs.gitlab.com/ee/user/application_security/secret_detection/secret_push_protection/#enable-secret-push-protection-in-a-project
Added WSDL URLs for L3 users to reference when migrating to the new Integration Service.