docs: Notifications REST API missing `member_feature_requested` reason

[setchy]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/rest/activity/notifications?apiVersion=2022-11-28

What part(s) of the article would you like to see updated?

Add the reason member_feature_requested

Additional information

[nguyenalex836]

@setchy Thank you for opening an issue and linking it to your PR! ✨

[github-actions]

Thanks for opening an issue! We've triaged this issue for technical review by a subject matter expert 👀