Do not use MR abbreviation in "Thread the conversations through all stages"

The abbreviation "MR" can be easily understood by people using GitLab, but difficult for the rest of the world.

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• b3f5233c - Let's just use "pull requests" instead of "Pull Requests (Merge Requests)"

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@sytses what do you think? Adam suggested "Merge requests (Pull Requests)" first, but it adds too much noise, since we had to repeat it twice.

I think "merge requests" is fine on its own. I imagine anyone familiar with the term "pull request" should be able to figure out that they're actually requesting a merge.