[Update] Expand Language for Amateur Studios

[AdultSun]

From this thread on Discord, we should probably update the language in our section on Creating Amateur Studios.

1. There's confusion around how we want to handle pro-am content from RFC. We can mention them specifically within the section and clarify the difference between 1st party content produced by RFC themselves and the 3rd party pro-am content hosted on their RFC channels platform.
2. RFC Channels uses odd language to describe their age verification processes, but they appear to still require 2257 documentation from all of their creators. We may want to update the language to clarify that pro-am platforms are required to be "2257 compliant"
3. We may want to just create two bulleted lists of "approved platforms" and "disallowed platforms"
4. On first glance, this section looks a bit too dense and wordy. It could be better organized, breaking up some of these blocks of text. The lists in point 3 could help with that, or alternatively we could split some of this up into multiple pages.