docs: Remove duplicated phrase am: c08a545a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20759942



Change-Id: I44e284be393b6eac82d5b5b9546348f348f364e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>