Update comment

Author: Exanite

tests/ClangSharp.PInvokeGenerator.UnitTests/CTest.cs

@@ -328,7 +328,7 @@ public Task UnsignedIntBitshiftTest()
 ";
 
         // Non-ideal cases:
-        // UChar
+        // UByte
         // IntMin
         // ULongMax
         // Hexadecimal