docs(learn/protocol): links and testnet name update (#1256)

updates code links in protocol portals section and updates learn section
docs testnet holesky to sepolia

task: https://app.asana.com/0/1206208509925075/1207559459891672/f

docs/site/docs/learn/testnet/testnet.md

@@ -12,12 +12,12 @@ The Omni Omega Testnet is currently under construction. Please check back soon f
 
 During the Omni Omega Testnet, users will be able to delegate restaked **\$ETH** to the Omni Operators and take part in challenges posted in a site soon to be released.
 
-## Delegating Holesky \$ETH
+## Delegating Sepolia \$ETH
 
 You can delegate testnet **\$ETH** to secure Omni through EigenLayer. Check out [this blog post](https://news.omni.network/omni-omega-phase-two-how-to-delegate/) and follow the instructions to delegate. A succinct summary of the steps is below:
 
-1. Have Holesky as a network to your browser wallet, funded with Holesky **\$ETH**. [Read more on how here](https://www.coingecko.com/learn/holesky-testnet-eth).
-2. Swap Holesky **\$ETH** for any of the [EigenLayer supported restaking tokens](https://docs.eigenlayer.xyz/eigenlayer/restaking-guides/restaking-user-guide/stage-2-testnet/obtaining-testnet-eth-and-liquid-staking-tokens-lsts).
+1. Have Sepolia as a network to your browser wallet, funded with Sepolia **\$ETH**. [Read more on how here](https://www.coingecko.com/learn/sepolia-eth).
+2. Swap Sepolia **\$ETH** for any of the [EigenLayer supported restaking tokens](https://docs.eigenlayer.xyz/eigenlayer/restaking-guides/restaking-user-guide/testnet/obtaining-testnet-eth-and-liquid-staking-tokens-lsts).
 3. Connect your wallet to the [EigenLayer dashboard](https://holesky.eigenlayer.xyz/).
 4. Restake your restaking tokens on the [dashboard restake section](https://holesky.eigenlayer.xyz/restake).
 5. Delegate your restaked tokens to any of the Omni Operators.

docs/site/docs/protocol/xmessages/components/portals.md

@@ -18,7 +18,7 @@ To initiate a cross-chain call, the Portal Contract provides the `xcall` method.
 
 Below is a summarized fragment for the underlying logic beneath `xcall` from the [Portal contract Solidity source](https://github.com/omni-network/omni/blob/1439d8a99f66a3bb3b7d113c63f8f073512c5377/contracts/src/protocol/OmniPortal.sol):
 
-<GitHubCodeBlock url="https://github.com/omni-network/omni/blob/d691e4baced919d86091c7dc3a3ecac7966c8321/contracts/src/protocol/OmniPortal.sol#L135-L151" />
+<GitHubCodeBlock url="https://github.com/omni-network/omni/blob/3064e8ad22557c8756547f1875d026e348846c9d/contracts/src/xchain/OmniPortal.sol#L100-L129" />
 
 For detailed instructions on conducting cross-chain transactions, refer to the [developer section](../../../develop/introduction.md).
 
@@ -71,7 +71,7 @@ To ensure the integrity and authenticity of incoming cross-chain messages, the f
 
 Below is a summarized fragment for the validations in `xsubmit` from the [Portal contract Solidity source](https://github.com/omni-network/omni/blob/main/contracts/src/protocol/OmniPortal.sol):
 
-<GitHubCodeBlock url="https://github.com/omni-network/omni/blob/059303647e07fc3481e379b710922e2b84b1827f/contracts/src/protocol/OmniPortal.sol#L165-L220" />
+<GitHubCodeBlock url="https://github.com/omni-network/omni/blob/3064e8ad22557c8756547f1875d026e348846c9d/contracts/src/xchain/OmniPortal.sol#L146-L183" />
 
 </details>