Update CODEOWNERS to allow maintainers to merge Contribute docs
What does this MR do and why?
Modifies the TW CODEOWNERS rake task to assign contributor docs (anything in the /doc/development
directory) to Engineering teams instead of Technical Writers.
Closes https://gitlab.com/gitlab-org/gitlab/-/issues/428651
Related to #397788
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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