Add Notes: Motion detection not supported on HiSilicon <V200 platforms

[henryptung]

For the V100 SOCs here, a note mentioning OpenIPC/majestic#233 (comment) would help avoid confusion from users trying to poke the Majestic binary to find out how to enable motion detection.

[henryptung]

Aside: not sure why https://github.com/OpenIPC/website/blob/671c09cd56c3479550bcad4525808b44f62a8e20/app/views/cameras/socs/show.html.erb#L78-L81 is commented out? Seems like it exists in the schema, at any rate.