wrong command for 2.7k 4:3 in HERO7-Commands.md, and other things.

[gadgethacker730]

trafficstars

Problem: You list: http://10.5.5.9/gp/gpControl/setting/2/3 as the command for 2.7K 4:3

but that doesn't work, and the correct command is http://10.5.5.9/gp/gpControl/setting/2/6

I have to wonder if this was inherited from previous models. I tested on the hero 7 black.

Also I think it's worth pointing out on that page that the aspect ratio MUST be set in correct combination with the resolution command, and AR should be set first, or you can get UI corruption and then crashes. AR first, because incompatible AR changes are safe in the event of a disconnect, where incompatible resolution changes are not.

Finally I don't find very clear documentation of the bluetooth interface. Specifically the correct service characterstic to send commands to, which is service 0000fea6... characteristic b5f90072... Just a potentially helpful thing to mention somewhere.