release-notes: Add release note about getblock verbosity level 3.

doc/release-notes.md

@@ -76,6 +76,14 @@ Updated RPCs
   `gettransaction verbose=true` and REST endpoints `/rest/tx`, `/rest/getutxos`,
   `/rest/block` no longer return the `addresses` and `reqSigs` fields, which
   were previously deprecated in 22.0. (#22650)
+- The `getblock` RPC command now supports verbose level 3 containing transaction inputs
+  `prevout` information.  The existing `/rest/block/` REST endpoint is modified to contain
+  this information too. Every `vin` field will contain an additional `prevout` subfield
+  describing the spent output. `prevout` contains the following keys:
+  - `generated` - true if the spent coins was a coinbase.
+  - `height`
+  - `value`
+  - `scriptPubKey`
 
 - `listunspent` now includes `ancestorcount`, `ancestorsize`, and
   `ancestorfees` for each transaction output that is still in the mempool.