[docs] Minor spelling fixes

Change-Id: If4b64f49ac5b79e6bfa47dfd5f29caa50cb6ad48
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1703614
Reviewed-by: michael liao <weijliao@google.com>
Fuchsia-Auto-Submit: Christopher Johnson <crjohns@google.com>
Commit-Queue: Christopher Johnson <crjohns@google.com>
1 file changed