docs(hello.c): remove comment about printf, was incorrect

my C is rusty it seems

code/hellorld/hello.c

@@ -7,7 +7,6 @@
 #include <stdio.h>
 
 int main(VOID) {
-	// Does sprintf work here? The SDK is probably too old, but modern conventions would be nice
 	printf("Hellorld!");
 	// Wait for a key to be pressed
 	getchar();