Update the NDK API Council landing page.

Updated the list of API domains we handle, the process for design review, and moved the "how do I remove/deprecate stuff?" bit to the guidelines doc so it's next to the table that says "forever" for most thing.

The instructions for deprecation have also been updated to point at `__DEPRECATED_IN()` rather than removing stuff from the headers/stubs since we've got that now and it's way better for users.

PiperOrigin-RevId: 678859947
Change-Id: I0d87a01f8bff5bb700c0496e21c5d3fcb66e3e97
1 file changed
tree: 472fec3297b87bce01c2d1257c550e29f9a21ec0
  1. api-guidelines/