Update PoS files

Author: hsutaiyu

docs/pos/how-to/bridging/ethereum-polygon/ethereum-to-matic.md

@@ -151,7 +151,7 @@ let receiver = new matic.eth.Contract(JSON.parse(receiverABI), receiverAddress)
 
 We're using `@maticnetwork/meta` package for the RPCs, the package isn't a requirement to run the script.
 
-`matic` and `main` objects refer to the web3 object initialized with Polygon's and Ropsten's RPC respectively.
+`matic` and `main` objects refer to the web3 object initialized with Polygon Amoy and Sepolia network's respective RPC URLs.
 
 `sender` and `receiver` objects refer to the contract objects of `Sender.sol` and `Receiver.sol` that we deployed in Step 1 and 2.
 

docs/pos/how-to/troubleshoot/technical-faqs.md

@@ -176,7 +176,7 @@ and start Heimdall services again. You can refer to this [guide](../validator/pr
 
 ### 5. From where do I create the API key?
 
-You can access this link: [https://infura.io/register](https://infura.io/register) . Make sure that once you have setup your account and project, you copy the API key for Ropsten and not Mainnet.
+You can access this link: [https://infura.io/register](https://infura.io/register) . Make sure that once you have setup your account and project, you copy the API key for Sepolia and not mainnet.
 
 Mainnet is selected by default.