add doc_markdown clippy lint (#8552)

Co-authored-by: Alexey Shekhirin <a.shekhirin@gmail.com>
Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/ethereum/consensus/src/lib.rs

@@ -31,7 +31,7 @@ pub struct EthBeaconConsensus {
 }
 
 impl EthBeaconConsensus {
-    /// Create a new instance of [EthBeaconConsensus]
+    /// Create a new instance of [`EthBeaconConsensus`]
     pub fn new(chain_spec: Arc<ChainSpec>) -> Self {
         Self { chain_spec }
     }