fix doc

crates/payload/builder/src/lib.rs

@@ -31,7 +31,7 @@
 //! use alloy_consensus::Header;
 //! use alloy_primitives::U256;
 //! use reth_payload_builder::{EthBuiltPayload, PayloadBuilderError, KeepPayloadJobAlive, EthPayloadBuilderAttributes, PayloadJob, PayloadJobGenerator, PayloadKind};
-//! use reth_primitives::Block;
+//! use reth_primitives::{Block, BlockExt};
 //!
 //! /// The generator type that creates new jobs that builds empty blocks.
 //! pub struct EmptyBlockPayloadJobGenerator;