glab-mr*: add pages (#7635)

pages/common/glab-mr-create.md

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+# glab mr create
+
+> Manage GitLab merge requests from the command-line.
+> More information: <https://glab.readthedocs.io/en/latest/mr/create.html>.
+
+- Interactively create a merge request:
+
+`glab mr create`
+
+- Create a merge request, determining the title and description from the commit messages of the current branch:
+
+`glab mr create --fill`
+
+- Create a draft merge request:
+
+`glab mr create --draft`
+
+- Create a merge request specifying the target branch, title, and description:
+
+`glab mr create --target-branch {{target_branch}} --title "{{title}}" --description "{{description}}"`
+
+- Start opening a merge request in the default web browser:
+
+`glab mr create --web`

pages/common/glab-mr-merge.md

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+# glab mr merge
+
+> Merge GitLab merge requests.
+> More information: <https://glab.readthedocs.io/en/latest/mr/merge.html>.
+
+- Merge the merge request associated with the current branch interactively:
+
+`glab mr merge`
+
+- Merge the specified merge request, interactively:
+
+`glab mr merge {{mr_number}}`
+
+- Merge the merge request, removing the branch on both the local and the remote:
+
+`glab mr merge --remove-source-branch`
+
+- Squash the current merge request into one commit with the message body and merge:
+
+`glab mr merge --squash --message="{{commit_message_body}}"`
+
+- Display help:
+
+`glab mr merge --help`

pages/common/glab-mr.md

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+# glab mr
+
+> Manage GitLab merge requests from the command-line.
+> Some subcommands such as `glab mr create` have their own usage documentation.
+> More information: <https://glab.readthedocs.io/en/latest/mr>.
+
+- Create a merge request:
+
+`glab mr create`
+
+- Check out a merge request locally:
+
+`glab mr checkout {{mr_number}}`
+
+- View the changes made in the merge request:
+
+`glab mr diff`
+
+- Approve the merge request for the current branch:
+
+`glab mr approve`
+
+- Merge the merge request associated with the current branch interactively:
+
+`glab mr merge`
+
+- Edit a merge request interactively:
+
+`glab mr update`
+
+- Edit the target branch of a merge request:
+
+`glab mr update --target-branch {{branch_name}}`