Variable "royaltyVaultIpId" (and respective docs) unclear

[aandrewchung]

Description and context

collectRoyaltyTokens, claimableRevenue, claimRevenue, snapshot, and getRoyaltyVaultAddress should use a different variable name instead of royaltyVaultIpId. This is unclear to users because users are supposed to pass in the derivative/child ip id so that we can calculate the proxy address of the vault but this does not seem obvious by documentation or variable names.

Suggested solution

Rename variable to childIpId to be more clear and update docs

Definition of done

Code merged and documentation updated