Fix example command schema to match the expectations of the server

Actually tested the example schemas against real production server
and fixed inconsitencies in command definitions.

Change-Id: I7d8deea11b9501af28bd0bb485b88201af5404c0
Reviewed-on: https://weave-review.googlesource.com/1655
Reviewed-by: Vitaly Buka <vitalybuka@google.com>