Kernel: init: Make comment clearer

Kernel/init.cpp

@@ -100,8 +100,8 @@ namespace Kernel {
 [[noreturn]] static void init_stage2(void*);
 static void setup_serial_debug();
 
-// boot.S expects these functions precisely this this. We declare them here
-// to ensure the signatures don't accidentally change.
+// boot.S expects these functions to exactly have the following signatures.
+// We declare them here to ensure their signatures don't accidentally change.
 extern "C" void init_finished(u32 cpu);
 extern "C" [[noreturn]] void init_ap(u32 cpu, Processor* processor_info);
 extern "C" [[noreturn]] void init();