update testnet address (#493)

Author: Marketen

docs/smooth/subscribe-to-smooth/overview.md

@@ -15,5 +15,5 @@ You have **two options** to subscribe to [Smooth](https://smooth.dappnode.io/):
 
 :::info
 - Smooth **Mainnet** Address: `0xAdFb8D27671F14f297eE94135e266aAFf8752e35`
-- Smooth **Testnet** (Holesky) Address: `0xE91c7Bbc671E6b2b316f15Db259819C27Bd1f15C`
+- Smooth **Testnet** (Hoodi) Address: `0x9CDcc499D53Be0ADb5056355Be774828a593F267`
 :::