I think multisig and P2SH should be in the transaction section; however, with a multi-person example, I can understand why you put them in the contracts section---especially since I start the escrow contract off using the example from the multisig subsection.

How do you feel above moving multisig and p2sh back to the transaction section, and then rewriting the examples so that multisig uses a one-person multisig-protected wallet and escrow sets up its own situation?  (I'm happy to do the rewrites/re-diagramming if you want.)