Add what's new.

Signed-off-by: bgravenorst <[email protected]>

Author: bgravenorst

docs/whats-new.md

@@ -11,6 +11,7 @@ of the [MetaMask developer page](https://metamask.io/developer/).
 
 ## November 2024
 
+- Documented [updated error responses](/services/reference/ethereum/json-rpc-methods) when rate-limiting Infura JSON-RPC API calls. ([#1749](https://github.com/MetaMask/metamask-docs/pull/1749))
 - Documented [Unichain Sepolia](/services/reference/unichain) support. ([#1725](https://github.com/MetaMask/metamask-docs/pull/1725))
 - Updated Snaps [Custom UI documentation](/snaps/features/custom-ui/) for MetaMask Extension version 12.6.
   ([#1715](https://github.com/MetaMask/metamask-docs/pull/1715))