docs(sdk): get_first_nonce_in_queue_from_batcher

Author: MarcosNicolau

docs/3_guides/1.2_SDK_api_reference.md

@@ -307,6 +307,30 @@ pub async fn get_nonce_from_batcher(
 
 - `EthRpcError` if the batcher has an error in the Ethereum call when retrieving the nonce if not already cached.
 
+### `get_first_nonce_in_queue_from_batcher`
+
+Returns the nonce of the proof with the lowest nonce inside the batcher queue for a given address. This might be useful when you proofs are stuck in the batcher due to a low fee and you need to bump them.
+
+```rust
+pub async fn get_first_nonce_in_queue_from_batcher(
+    batcher_ws_url: &str,
+    address: Address,
+) -> Result<U256, GetNonceError>
+```
+#### Arguments
+
+
+- `batcher_url` - The batcher websocket url.
+- `address` - The user address for which the nonce will be retrieved.
+
+#### Returns
+
+- `Result<U256, NonceError>` - The nonce of the first proof for the given address.
+
+#### Errors
+
+- `NoProofsInQueue` if the batcher does not have proofs in the queue for the given address. 
+
 ### `get_chain_id`
 
 Returns the chain id for a given rpc url.