Docs: Revist MR default template
Merge request default template
## What does this MR do?
## Are there points in the code the reviewer needs to double check?
## Why was this MR needed?
## Screenshots (if relevant)
## Does this MR meet the acceptance criteria?
- [ ] [Changelog entry](https://docs.gitlab.com/ee/development/changelog.html) added, if necessary
- [ ] [Documentation created/updated](https://docs.gitlab.com/ee/development/doc_styleguide.html)
- [ ] API support added
- [ ] Tests added for this feature/bug
- Conform by the [code review guidelines](https://docs.gitlab.com/ee/development/code_review.html)
- [ ] Has been reviewed by a UX Designer
- [ ] Has been reviewed by a Frontend maintainer
- [ ] Has been reviewed by a Backend maintainer
- [ ] Has been reviewed by a Database specialist
- [ ] Conform by the [merge request performance guides](https://docs.gitlab.com/ee/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ee/blob/master/CONTRIBUTING.md#style-guides)
- [ ] If you have multiple commits, please combine them into a few logically organized commits by [squashing them](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
- [ ] Internationalization required/considered
- [ ] End-to-end tests pass (`package-and-qa` manual pipeline job)
## What are the relevant issue numbers?
Edited by Achilleas Pipinellis