Fix typographical errors found by RETF rules in arch-design

Change-Id: I1f10b7380417287e434cdc1edbe21bbc19a9d1c1
Link Twitter accounts in the architecture guide

Change-Id: I78c8b9c55ef5f6aa1c24212d0908dac3d62d078b
Merge "Fix typographical errors found by RETF rules in arch-design"
Merge "Link Twitter accounts in the architecture guide"