Update torch brightness max level description. am: 8dbfe05302 am: 5e69d77732 am: 60e0f4af05

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/19386357

Change-Id: I2a4931296b15e2643f1963eba409ef7011b7b8d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>