update node operator instructions

OP Sepolia needs to be initialized with a genesis file.

src/docs/developers/bedrock/node-operator-guide.md

@@ -59,7 +59,7 @@ Even though the Docker image for the Execution Engine is called `op-geth`, the a
 
 We'll start with `op-geth`'s configuration because it is more complex. As mentioned before, `op-geth` is a minimal fork of `go-ethereum`. As a result, it stores its state in a database that requires initialization. Initialization is done one of two ways, depending on which network you're deploying:
 
-1. **With a Genesis File:** This is for OP Sepolia, and other testnets or deployments that are not migrated from a legacy network. In this case, you'll download the todo: update with link [genesis file]() and initialize the data directory via `geth init`.
+1. **With a Genesis File:** This is for OP Sepolia, and other testnets or deployments that are not migrated from a legacy network. In this case, you'll download the [genesis file](https://networks.optimism.io/op-sepolia/genesis.json) and initialize the data directory via `geth init`.
 2. **With a Data Directory:** This is used for networks that are migrated from a legacy network. This would include OP Mainnet and OP Goerli. In this case, you'll download a preconfigured data directory and extract it. No further initialization is necessary in this case, because the data directory contains the network's genesis information. 
 
 Regardless of how `op-geth` is initialized, you'll need to ensure that you have sufficient disk space available to store the network's data. As of this writing, the mainnet data directory is ~100GB for a full node and ~1TB for an archival node. The OP Goerli data directory is ~40GB for a full node.
@@ -73,8 +73,7 @@ Instructions for each initialization method are below. If you're spinning up an
 ```bash
 #!/bin/sh
 FILE=/$DATADIR/genesis.json
-todo: update url
-OP_GETH_GENESIS_URL=https://storage.googleapis.com/oplabs-network-data/Sepolia/genesis.json
+OP_GETH_GENESIS_URL=https://networks.optimism.io/op-sepolia/genesis.json
 
 if [ ! -s $FILE ]; then
   apk add curl

src/docs/developers/nodes/testnet.md

@@ -14,8 +14,7 @@ Migrated Networks, *OP Mainnet* and *OP Goerli*, were running before the Bedrock
 OP Sepolia is non-migrated network so it requires [initialization via genesis file](../bedrock/node-operator-guide/#initialization-via-genesis-file). `op-geth` uses JSON files to encode a network's genesis information. You'll need to download the genesis JSON, then run the following command to initialize the data directory:
 
 ```bash
-todo: update link
-curl -o <path to genesis JSON> -sL <URL to genesis JSON>
+curl -o <path to genesis JSON> -sL https://networks.optimism.io/op-sepolia/genesis.json
 
 geth init \
 	 --datadir="<your data directory>" \
@@ -68,7 +67,8 @@ In the root of your working directory create a new directory: `scripts`.
       --rollup.sequencerhttp=$SEQUENCER_URL \
       --nodiscover \
       --syncmode=full \
-      --maxpeers=0
+      --maxpeers=0 \
+      --beta.op-network=op-sepolia
     ```
 
 Other Sequencer URLs can be found here: [Networks, Public RPC Endpoints, & APIs](../../useful-tools/networks.md).
@@ -110,8 +110,8 @@ Other Sequencer URLs can be found here: [Networks, Public RPC Endpoints, & APIs]
         --l2.jwt-secret=./jwt.txt \
         --network=$NET \
         --rpc.addr=0.0.0.0 \
-        --rpc.port=8547
-
+        --rpc.port=8547 \
+        --network=op-sepolia
     ```     
 
 

src/docs/useful-tools/networks.md

@@ -221,7 +221,7 @@ These parameters are mostly useful to people responsible for running and adminis
 
 - Note that there is no Bedrock Data Directory or Legacy Geth Data Directory required for running OP Sepolia nodes
 - [Configuration parameters](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/deploy-config/sepolia.json)
-- todo: update link [Genesis.json File]()
+- [Genesis.json File](https://networks.optimism.io/op-sepolia/genesis.json)
 - [Latest releases of `op-geth`](https://github.com/ethereum-optimism/op-geth/releases/latest)
 - [Latest release of `op-node`](https://github.com/ethereum-optimism/optimism/releases/latest)
 - Note: Unlike on OP Mainnet or OP Goerli, you do not need to run `legacy-geth` to run an archival OP Sepolia node.