rephrase some language in code and comments

This rephrases some code and comments to avoid unclear and
non-inclusive wording. For the remaining terms in unblocked_terms.txt,
comments are added to explain why these terms are present in the code.

BUG=chromium:1099035
TEST=repo hooks

Change-Id: I985613d811836b6fb6351eadcf3e08a3290db97f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2419656
Tested-by: Bob Haarman <inglorion@chromium.org>
Reviewed-by: Manoj Gupta (OoO) <manojgupta@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
8 files changed