Add orbit validator setting docs

arbitrum-docs/run-arbitrum-node/more-types/02-run-validator-node.md

@@ -57,6 +57,7 @@ Here we describe different strategies that validators follow and provide instruc
   ```shell
   docker run --rm -it  -v /some/local/dir/arbitrum:/home/user/.arbitrum @latestNitroNodeImage@ --parent-chain.connection.url=https://l1-mainnet-node:8545 --chain.id=42161 --node.staker.enable --node.staker.strategy=Defensive --parent-chain.wallet.password="SOME SECURE PASSWORD"
   ```
+- For orbit chains, you need to set `--chain.info-json=<Orbit Chain's chain info>` instead of `--chain.id=<chain id>`
 - To verify validator is working, this log line shows the wallet is setup correctly:
   ```shell
   INFO [09-28|18:43:49.367] running as validator                     txSender=0x... actingAsWallet=0x... whitelisted=true strategy=Defensive
@@ -66,3 +67,10 @@ Here we describe different strategies that validators follow and provide instruc
   - `txSender` and `actingAsWallet` should both be present and not `nil`
   - The log line `validation succeeded` shows that the L2 block validator is working
   - The log line `found correct assertion` shows that the L1 validator is working
+
+#### Orbit chains: grant whitlelist
+
+- You need to be chain owner to grant whitlelist to a new validator address:
+- Find your `upgradeExecutor` contract address.
+- Send trancation to method `executeCall` of `upgradeExecutor` contract and set the `target` address to your rollup contract address, set the `targetCalldata` to `0xa3ffb772{Your new whitelist validator address}`. (`0xa3ffb772` is the signature of `setValidator(address[],bool[])`)
+- Call to `isValidator(address)` of your rollup contract and check the result.

website/sidebars.js

@@ -324,6 +324,13 @@ const sidebars = {
           // q: why use an anchor html tag here?
           // a: see note at end of file
         },
+        {
+          type: 'html',
+          value:
+            '<a class="menu__link menu__list-item" href="/run-arbitrum-node/more-types/run-validator-node">Add new validators to Orbit chain <span class="other-section-icon">↓</span></a>',
+          // q: why use an anchor html tag here?
+          // a: see note at end of file
+        },
         {
           type: 'doc',
           id: 'launch-orbit-chain/concepts/anytrust-orbit-chain-keyset-generation',