[DOC] include a bug URL for every API

[DanAlbert]

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URL

https://developer.android.com/ndk/reference

Problem

The API reference docs should include a bug URL for every API we ship. Folks often end up here asking for API help which we're not able to provide. If each defgroup had a bug URL associated with it we'd know where to point them (and they'd hopefully find it themselves).

We should also probably require a point-of-contact for each API so we know who to CC for questions when needed.

[enh-google]

If each defgroup had a bug URL associated with it we'd know where to point them (and they'd hopefully find it themselves).

yeah, good idea! that sounds like the best place to record this.