docs: Adjusted language to avoid gender-specific terminology. am: ad19ed2577 am: 69863b517d am: 2451350b78 am: 062fb961b2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12347127

Change-Id: I0eddbc1888483b297ed77cb8607f11699d86e3bc