Fix errors in codeowners file

[gewarren]

These users don't have write access and break the file.

[opbld33]

Learn Build status updates of commit 47bb1ed:

✅ Validation status: passed

File	Status	Preview URL	Details
.github/CODEOWNERS	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[BillWagner]

I'm fine with this change, but I'll defer to @jeffhandley

I'd also be fine with adding those folks to the api-docs-write team. @gewarren I added you as a maintainer of that team if that's the right change here, or in the future.