Update merge request template copy

Alex Buijsrequested to merge
update-merge-request-template-copy into master

What does this MR do and why?

Update merge request template copy for Vulnerability Resolution by AI.

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/473466/

Screenshots or screen recordings

Before After
Screenshot_2024-07-31_at_09.49.20 Screenshot_2024-07-31_at_09.48.32
Edited by Alex Buijs

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