Update genesis.mdx

Here is the ethereum-optimism/optimism#11181 that updated that part of the code to remove the --l1-starting-block flag and instead always use the --l1-rpc to read the startBlock info from onchain.
ethereum-optimism · Aug 15, 2024 · 67755e2 · 67755e2
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commit 67755e2
Showing 1 changed file with 0 additions and 5 deletions.
diff --git a/pages/builders/chain-operators/deploy/genesis.mdx b/pages/builders/chain-operators/deploy/genesis.mdx
@@ -78,11 +78,6 @@ go run cmd/main.go genesis l2 \
   --l1-rpc=<RPC URL for an Ethereum L1 node. Cannot be used with --l1-starting-bloc>>
 ```
 
-Alternatively, you can omit `--l1-rpc` and use `--l1-starting-block`. This option
-lets you provide a path to a JSON file containing the L1 starting block. This
-overrides the need for using an L1 RPC to fetch the block. It cannot be used
-with `--l1-rpc`.
-
 ## Next Steps
 
 *   Learn how to [initialize](/builders/node-operators/configuration/base-config#initialization-via-genesis-file)