Use // line comments not /* block comments

include/util.hpp

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: MIT */
+// SPDX-License-Identifier: MIT
 
 #ifndef RGBDS_UTIL_HPP
 #define RGBDS_UTIL_HPP
@@ -9,9 +9,7 @@
 
 char const *printChar(int c);
 
-/*
- * @return The number of bytes read, or 0 if invalid data was found
- */
+// @return The number of bytes read, or 0 if invalid data was found
 size_t readUTF8Char(std::vector<int32_t> *dest, char const *src);
 
 #endif // RGBDS_UTIL_HPP