Replace obsolete with deprecated

[skyclouds2001]

What information was incorrect, unhelpful, or incomplete?

see #797 (comment)

mdn/content and mdn/browser-compat-data has already no longer use obsolete anymore, and replace it with deprecated

What did you expect to see?

same as above

Do you have any supporting links, references, or citations?

https://developer.mozilla.org/en-US/docs/MDN/Writing_guidelines/Experimental_deprecated_obsolete, explains why obsolete should not to be used and deprecated should be used

Do you have anything more you want to share?

No response

[bsmth]

In general, I think this is a good idea, it might be nice to check if this is a breaking change or not. I don't know of any consumers who rely on this status for anything.

Also for historical reasons:

• RFC: Deprecated vs. Obsolete browser-compat-data#265