For the sake of consistency, removes any extraneous
consecutive blank lines from the doc suite.

Replace all '9koXpg98eAheJpvBs5tK' occurrences with
'<your_access_token>' in API docs.

Replace all '9koXpg98eAheJpvBs5tK' occurrences with
'<your_access_token>' in API docs.

With this action the user can update the execute_filemode of a given file in the repository.

Signed-off-by: Rémy Coutable <remy@rymai.me>

- Original work for the web interface here:
 - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13713

- Apply some refactoring for code reuse
- Add file status validation for Files::DeleteService
- Write additional specs

When commiting multiple files we're now checking if any of those files
has been modified by another commit and we're rejecting the new commit
in this case.

Closes #35692.

Documentation bugfix of invalid JSON payload example of Create a commit with multiple files and actions

Fixes #23895.