Rephrase "maintainer" to more precise "members who can merge to the target branch"42751-rename-mr-maintainer-push

"Maintainer" will be freed to be used for #42751

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diff --git a/doc/user/project/merge_requests/allow_collaboration.md b/doc/user/project/merge_requests/allow_collaboration.md
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+# Allow collaboration on merge requests across forks
+
+> [Introduced][ce-17395] in GitLab 10.6.
+
+This feature is available for merge requests across forked projects that are
+publicly accessible. It makes it easier for members of projects to
+collaborate on merge requests across forks.
+
+When enabled for a merge request, members with merge access to the target
+branch of the project will be granted write permissions to the source branch
+of the merge request.
+
+The feature can only be enabled by users who already have push access to the
+source project, and only lasts while the merge request is open.
+
+Enable this functionality while creating or editing a merge request:
+
+![Enable collaboration](./img/allow_collaboration.png)
+
+[ce-17395]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17395