docs: small fixes (#279)

* fix: properly mark clickable link

* fix: properly mark hash zero comment

src/eth/primitives/account.rs

@@ -52,7 +52,7 @@ impl Account {
 
     /// Checks the current account is empty.
     ///
-    /// https://eips.ethereum.org/EIPS/eip-7523#:~:text=An%20empty%20account%20is%20an%20account
+    /// <https://eips.ethereum.org/EIPS/eip-7523#:~:text=An%20empty%20account%20is%20an%20account>
     pub fn is_empty(&self) -> bool {
         self.nonce.is_zero() && self.balance.is_zero() && self.bytecode.is_none()
     }

src/eth/primitives/hash.rs

@@ -35,7 +35,7 @@ impl Hash {
         Self(H256::random())
     }
 
-    // Returns the zero hash
+    /// Returns the zero hash
     pub fn zero() -> Self {
         Self(H256::zero())
     }