Support title and desc on merge w/ push optionlabel-descr-push-opts

MergeRequests::PushOptionsHandlerService has been updated to allow
creating and updating merge requests with the `title` and
`description` set using git push options.

To create a new merge request and set its title and description:

      git push -u origin -o merge_request.create \
        -o merge_request.title="My title" \
        -o merge_request.description="My description"

To update an existing merge request and set its title and
description:

      git push -u origin -o merge_request.title="My title" \
        -o merge_request.description="My description"

Issue https://gitlab.com/gitlab-org/gitlab-ce/issues/64320

1 files changed, 24 insertions, 0 deletions

diff --git a/doc/user/project/merge_requests/index.md b/doc/user/project/merge_requests/index.md
index d5ca853eff5..f78ec9d96e6 100644
--- a/doc/user/project/merge_requests/index.md
+++ b/doc/user/project/merge_requests/index.md
@@ -343,6 +343,30 @@ git push -o merge_request.remove_source_branch
 You can also use this push option in addition to the
 `merge_request.create` push option.
 
+### Set merge request title using git push options
+
+To set the title of an existing merge request, use
+the `merge_request.title` push option:
+
+```sh
+git push -o merge_request.title="The title I want"
+```
+
+You can also use this push option in addition to the
+`merge_request.create` push option.
+
+### Set merge request description using git push options
+
+To set the description of an existing merge request, use
+the `merge_request.description` push option:
+
+```sh
+git push -o merge_request.description="The description I want"
+```
+
+You can also use this push option in addition to the
+`merge_request.create` push option.
+
 ## Find the merge request that introduced a change
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/2383) in GitLab 10.5.