Improve `logcat --help`. am: c0cafdb9f7

Original change: https://android-review.googlesource.com/c/platform/system/logging/+/2458962

Change-Id: I946cfe6f72f78a9000896226f4ea2b9306b43fea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: f5b38a783049d5bbe5d101473e3a5fb318af625e
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/
  5. rust/
  6. OWNERS
  7. PREUPLOAD.cfg
  8. TEST_MAPPING