Minor update to testnet ETH page (#885)

* Add ENS guide callout

* Build

docs/get-started/how-to/get-testnet-eth.mdx

@@ -1,6 +1,7 @@
 ---
 title: Get Linea testnet ETH
 description: Learn how to get testnet ETH for Linea Sepolia.
+image: /img/socialCards/get-linea-testnet-eth.jpg
 ---
 
 To get started with building on Linea you'll need some Linea Sepolia ETH. The most efficient method
@@ -12,6 +13,12 @@ We recommend you use the [MetaMask faucet](https://docs.metamask.io/developer-to
 supports using Linea ENS names, and using one guarantees you'll receive the full 0.5 ETH daily 
 maximum.
 
+:::tip
+
+See our [support guide to getting a Linea ENS name](https://support.linea.build/explore/ens).
+
+:::
+
 ## Other faucets
 
 - [Infura](https://www.infura.io/faucet/linea)