Update create-l2-rollup.mdx

[hyunkicho]

Description
when I used this tutorial script it says it is using sepolia but chain id in getting started is 1. people will encounter this error like me if there are any warning about it

when I copy and pasted the script below I encounter error like below

forge script scripts/Deploy.s.sol:Deploy --private-key $GS_ADMIN_PRIVATE_KEY --broadcast --rpc-url $L1_RPC_URL --slow

It could be solved when I changed chain id to sepolia eth in getting-started configuration in below
original chain id is 1 so we need to warn people to change this chain id as sepolia network

optimism/packages/contracts-bedrock/deployments/getting-started/.chainId

Tests

[⠃] Compiling...
No files changed, compilation skipped
Traces:
  [57372465] → new Deploy@0x5b73C5498c1E3b4dbA84de0F1833c4a029d90519
    └─ ← [Return] 285705 bytes of code

  [287516] Deploy::setUp()
    ├─ [0] VM::projectRoot() [staticcall]
    │   └─ ← [Return] "/Users/chohk/git/blockchain101/layer2/optimism/packages/contracts-bedrock"
    ├─ [0] VM::envOr("DEPLOY_SCRIPT", "Deploy")
    │   └─ ← [Return] <env var value>
    ├─ [0] VM::envOr("DEPLOYMENT_CONTEXT", "")
    │   └─ ← [Return] <env var value>
    ├─ [0] VM::envOr("SIG", "run")
    │   └─ ← [Return] <env var value>
    ├─ [0] VM::envOr("DEPLOY_FILE", "run-latest.json")
    │   └─ ← [Return] <env var value>
    ├─ [0] VM::envOr("CHAIN_ID", 11155111 [1.115e7])
    │   └─ ← [Return] <env var value>
    ├─ [0] VM::toString(11155111 [1.115e7]) [staticcall]
    │   └─ ← [Return] "11155111"
    ├─ [0] VM::createDir("/Users/chohk/git/blockchain101/layer2/optimism/packages/contracts-bedrock/deployments/getting-started", true)
    │   └─ ← [Return] 
    ├─ [0] VM::readFile("/Users/chohk/git/blockchain101/layer2/optimism/packages/contracts-bedrock/deployments/getting-started/.chainId") [staticcall]
    │   └─ ← [Return] <file>
    ├─ [0] VM::envOr("STRICT_DEPLOYMENT", true)
    │   └─ ← [Return] <env var value>
    ├─ [0] VM::parseUint("1") [staticcall]
    │   └─ ← [Return] 1
    ├─ [0] VM::toString(11155111 [1.115e7]) [staticcall]
    │   └─ ← [Return] "11155111"
    └─ ← [Revert] revert: Misconfigured networks: 1 != 11155111


Error: 
script failed: <empty revert data>

Additional context

Metadata