tweak failing examples

hex-literal/README.md

@@ -47,10 +47,21 @@ assert_eq!(bytes1, bytes2);
 
 Using an unsupported character inside literals will result in a compilation error:
 ```rust,compile_fail
-# use hex_literal::hex;
-hex!("АА"); // Cyrillic "А"
-hex!("11　22"); // Japanese space
-hex!("0123 // Сomments inside literals are not supported");
+hex_literal::hex!("АА"); // Cyrillic "А"
+hex_literal::hex!("11　22"); // Japanese space
+```
+
+Сomments inside literals are not supported:
+```rust,compile_fail
+hex_literal::hex!("0123 // foo");
+```
+
+Every literal must contain an even number of hex characters:
+```rust,compile_fail
+hex_literal::hex!(
+    "01234"
+    "567"
+);
 ```
 
 ## Minimum Supported Rust Version