Update comments for kUnsupportedClassLoaderContextEncoding. am: 122ce6af4c am: 9073193438

Original change: https://android-review.googlesource.com/c/platform/art/+/2375892

Change-Id: I1e10cfad6be27156fd744f99e046d9e2113476a6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>