Add missing changes from CE MR

doc/workflow/merge_requests.md

-# Merge Requests
-
-Merge requests allow you to exchange changes you made to source code
-
-## Only allow merge requests to be merged if the build succeeds
-
-You can prevent merge requests from being merged if their build did not succeed
-in the project settings page.
-
-![only_allow_merge_if_build_succeeds](merge_requests/only_allow_merge_if_build_succeeds.png)
-
-Navigate to project settings page and select the `Only allow merge requests to be merged if the build succeeds` check box.
-
-Please note that you need to have builds configured to enable this feature.
-
-## Checkout merge requests locally
-
-### By adding a git alias
-
-Add the following alias to your `~/.gitconfig`:
-
-```
-[alias]
-    mr = !sh -c 'git fetch $1 merge-requests/$2/head:mr-$1-$2 && git checkout mr-$1-$2' -
-```
-
-Now you can check out a particular merge request from any repository and any remote, e.g. to check out a merge request number 5 as shown in GitLab from the `upstream` remote, do:
-
-```
-$ git mr upstream 5
-```
-
-This will fetch the merge request into a local `mr-upstream-5` branch and check it out.
-
-### By modifying `.git/config` for a given repository
-
-Locate the section for your GitLab remote in the `.git/config` file. It looks like this:
-
-```
-[remote "origin"]
-  url = https://gitlab.com/gitlab-org/gitlab-ce.git
-  fetch = +refs/heads/*:refs/remotes/origin/*
-```
-
-Now add the line `fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*` to this section.
-
-It should look like this:
-
-```
-[remote "origin"]
-  url = https://gitlab.com/gitlab-org/gitlab-ce.git
-  fetch = +refs/heads/*:refs/remotes/origin/*
-  fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*
-```
-
-Now you can fetch all the merge requests:
-
-```
-$ git fetch origin
-From https://gitlab.com/gitlab-org/gitlab-ce.git
- * [new ref]         refs/merge-requests/1/head -> origin/merge-requests/1
- * [new ref]         refs/merge-requests/2/head -> origin/merge-requests/2
-...
-```
-
-To check out a particular merge request:
-
-```
-$ git checkout origin/merge-requests/1
-```
-
-## Ignore whitespace changes in Merge Request diff view
-
-![MR diff](merge_requests/merge_request_diff.png)
-
-If you click the "Hide whitespace changes" button, you can see the diff without whitespace changes.
-
-![MR diff without whitespace](merge_requests/merge_request_diff_without_whitespace.png)
-
-It is also working on commits compare view.
-
-![Commit Compare](merge_requests/commit_compare.png)
-
-## Merge Requests versions
-
-Every time you push to merge request branch, a new version of merge request diff
-is created. When you visit the merge request page you see latest version of changes.
-However you can select an older one from version dropdown
-
-![Merge Request Versions](merge_requests/versions.png)
+This document was moved to [user/project/merge_requests](../user/project/merge_requests.md).