Audio Configs: incorrect/missing MCA

[JBoisseau-ByDeluxe]

the page: https://registry-page.isdcf.com/audioconfigs/
describes the mapping between CTT, MCA and Mainsound configuration.

1-
MCA Tags for HI/VI are incorrect:
should not be sgHI, sgVIN
but chHI, chVIN
as they are not soundgroups but individual channels

2-
When IAB, I suggest we highlight the presence of FSKSync in both MainSound Config + MCA.

[SteveLLamb]

Agreed, will update and update the pointers to the newest versions of the ref docs too.