Doc change: Design guidelines update.

Change-Id: Id37c0bfc1fe7e2c7156aab0ec85df123534c8c96
Bug-id: 11252971 11256762 11256765 11257156 11257769 11276296 11293924 11324992
(cherry picked from commit 0b734038a6ff6c19785ae3979c3085910b9208a0)
189 files changed