Fix broken nightly links. (#1896)

Signed-off-by: bgravenorst <byron.gravenorst@consensys.net>

Author: bgravenorst

docs/private-networks/tutorials/contracts/index.md

@@ -133,7 +133,7 @@ This example code creates the transaction `tx`, signs it with the private key of
 
 ## Use `eth_sendTransaction`
 
-You can use [`eth_sendTransaction`](https://ethereum.github.io/execution-apis/docs/reference/eth_sendtransaction) as an alternative to `eth_sendSignedTransaction`. However, Besu does not support the `eth_sendTransaction` API call and keeps account management separate for stronger security. Configure [Web3Signer](https://docs.web3signer.consensys.net/) with your Besu node to make the `eth_sendTransaction` API call.
+You can use [`eth_sendTransaction`](https://ethereum.org/developers/docs/apis/json-rpc/#eth_sendtransaction) as an alternative to `eth_sendSignedTransaction`. However, Besu does not support the `eth_sendTransaction` API call and keeps account management separate for stronger security. Configure [Web3Signer](https://docs.web3signer.consensys.net/) with your Besu node to make the `eth_sendTransaction` API call.
 
 Pass the following parameters to the [`eth_sendTransaction`](https://docs.web3signer.consensys.net/reference/api/json-rpc#eth_sendtransaction) call to Web3Signer. Web3Signer converts the request to an [`eth_sendRawTransaction`](../../../public-networks/reference/api/index.md#eth_sendrawtransaction) call that Besu uses:
 

docs/private-networks/tutorials/quickstart.md

@@ -617,7 +617,7 @@ Once complete, start the network up with `./run.sh`. When using the smart contra
 <!-- Links -->
 
 [bootnodes]: ../how-to/configure/bootnodes.md
-[permissions file]: ../how-to/use-local-permissioning
+[permissions file]: ../how-to/use-local-permissioning.md
 [static nodes]: ../../public-networks/how-to/connect/static-nodes.md
 [allow list]: ../how-to/use-local-permissioning.md#node-allowlisting
 [Import one of the existing accounts above into MetaMask]: https://metamask.zendesk.com/hc/en-us/articles/360015489331-Importing-an-Account-New-UI-