Update merge_requests.md with a simpler way to check out a merge request
The previous way was put under the "By modifying `.git/config` for a given repository" section. The disadvantage is that one has to modify `.git/config` for each repository that one uses. The new way was put under the "By adding a git alias" section. One has to create this git alias once, and then it will work from any repository, without having to modify `.git/config` over and over again.
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