Generalize guidance against embedding generated IDL code in APIs.

The text was already about AIDL, but it is more generally applicable to
other APIs that have their own generation mechanisms.

This text will be cited in some of my other work, so this adjustment makes
it more relevant in those other locations.

There is a recent discussion about adding protobuf APIs, and I realized this section focuses mostly on AIDL, but discussions about it are more general.

PiperOrigin-RevId: 712941460
Change-Id: I61655f9368b3e098fce375d54d3d0c9b84ff56b2
1 file changed
tree: d4dd14723ddafbbc26ccd89e0970ac76f906fcc7
  1. api-guidelines/