Fix comment type for rust doc
This change fixes a comment that should be a doc comment.
@@ -1022,7 +1022,7 @@ fn parse_hex(hex: &str) -> Result<Vec<u8>, AddressingError> {
Ok(res)
}
-// Compute a state address for a given namespace registry.
+/// Compute a state address for a given namespace registry.
///
/// # Arguments
///
