Func: Document that callbacks are now supported on Linux

func.go

@@ -62,9 +62,8 @@ func RegisterLibFunc(fptr interface{}, handle uintptr, name string) {
 // This means that using arg ...interface{} is like a cast to the function with the arguments inside arg.
 // This is not the same as C variadic.
 //
-// There are some limitations when using RegisterFunc on Linux. First, there is no support for function arguments.
-// Second, float32 and float64 arguments and return values do not work when CGO_ENABLED=1. Otherwise, Linux
-// has the same feature parity as Darwin.
+// There is one limitation when using RegisterFunc on Linux: There is no support for float32 and float64 arguments/return values with CGO_ENABLED=1.
+// Linux otherwise has the same feature parity as Darwin.
 //
 // # Memory
 //