Spot documentation needs updating

Some of the official spot documentation was last updated with spot v2.0

We are now on spot v5 (not sure what happened to v3 and v4, seems like we jumped from 2 to 5) and some of what are in the official docs are out of date.

For example the current use of “unbounded enrichment” that was updated with this proposal: Proposal to Update SPOT's Rollover Fee Configuration
is different than what is posted in the docs here, and the dynamic fees that are used in the bill broker and rotation vault are also misrepresented here in the official docs.

Thank you @cowboy :folded_hands: