Website: update Rust reference

Author: dannywillems

website/docs/developers/documentation-guidelines.md

@@ -35,10 +35,10 @@ https://github.com/o1-labs/mina-rust/blob/develop/path/to/file.rs#LStartLine-LEn
 
 Here's a real example from the zkApps documentation:
 
-<!-- CODE_REFERENCE: ledger/src/scan_state/transaction_logic.rs#L3588-L3592 -->
+<!-- CODE_REFERENCE: ledger/src/scan_state/transaction_logic/valid.rs#L80-L83-->
 
-```rust reference title="ledger/src/scan_state/transaction_logic.rs"
-https://github.com/o1-labs/mina-rust/blob/develop/ledger/src/scan_state/transaction_logic.rs#L3588-L3592
+```rust reference title="ledger/src/scan_state/transaction_logic/valid.rs"
+https://github.com/o1-labs/mina-rust/blob/develop/ledger/src/scan_state/transaction_logic/valid.rs#L80-L83
 ```
 
 ### Components explained