docs: fix formatting issue for required argument

[stefanfreitag]

All Submissions:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• Have you checked to ensure there aren't other open PRs for the same update/change?

What about the current behavior has changed?

The documentation for the resource azuredevops_git_repository contains a formatting issue: the argument initialization is rendered as heading.

This pull request resolves this issue and also fixes another minor formatting issue (multiple blanks when only one is required)

Does this introduce a change to go.mod, go.sum or vendor/?

• No

Does this introduce a breaking change?

• No

Any relevant logs, error output, etc?

Not applicable. Only documentation is updated.

Other information

None.