Merge pull request #901 from ethereum-optimism/cpengilly-patch-utm-tracking

Update create-l2-rollup.mdx

Author: cpengilly

pages/builders/chain-operators/tutorials/create-l2-rollup.mdx

@@ -275,7 +275,7 @@ It's recommended to fund the addresses with the following amounts when using Sep
 *   `Proposer` — 0.2 Sepolia ETH
 *   `Batcher` — 0.1 Sepolia ETH
 
-**To get the required Sepolia ETH to fund the addresses, we recommend using the [Superchain Faucet](https://console.optimism.io/faucet)** together with [Coinbase verification](https://help.coinbase.com/en/coinbase/getting-started/getting-started-with-coinbase/id-doc-verification).
+**To get the required Sepolia ETH to fund the addresses, we recommend using the [Superchain Faucet](https://console.optimism.io/faucet?utm_source=docs)** together with [Coinbase verification](https://help.coinbase.com/en/coinbase/getting-started/getting-started-with-coinbase/id-doc-verification).
 
 </Steps>