docs: Adjusted language to avoid gender-specific terminology. am: ad19ed2577 am: 2739d9f03a am: 6da6baaa6b

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

Change-Id: I795da40fcbcb872de8d61b0cf4779412bfba99f7