docs: Adjusted language to avoid gender-specific terminology. am: ad19ed2577 am: 2739d9f03a am: eadb008ea3

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

Change-Id: I0e18f7253d87635597b54be3bfc08bbc6fa35c9b