Update dispatchables doc link in pallet-revive's README (#7624)

Pallet-revive's README has an outdated link for dispatchables
documentation in its README. It was giving 404. Put the up-to-date one.

substrate/frame/revive/README.md

@@ -41,7 +41,7 @@ to handle that failure, either proceeding or reverting A's changes.
 ### Dispatchable functions
 
 Those are documented in the [reference
-documentation](https://paritytech.github.io/substrate/master/pallet_revive/index.html#dispatchable-functions).
+documentation](https://paritytech.github.io/polkadot-sdk/master/pallet_revive/pallet/dispatchables/index.html).
 
 ## Usage