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

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

Change-Id: Icf1d62cd26e5ce6753efe71c9059a9c39f86013c