Merge "libbinder_ndk: document #apex service caveats" am: 02491a7d1c am: d80ee01bf8 am: ca605a15af

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1653857

Change-Id: Ic6ffb4e615b201c2f321c460d2ff19f30b1e6abb