cleaned up comments in ktypes header

kinclude/ktypes.h

@@ -26,7 +26,7 @@ enum process_status {
     PROC_WAIT_SLEEP = 3,
 };
 
-// process structure:
+// forward define structs for recursive references
 typedef struct ProcessControlBlock ProcessControlBlock;
 struct loaded_binary;
 
@@ -91,10 +91,12 @@ typedef struct Optional##type { \
 #define has_value(optional) (optional.error == 0)
 #define has_error(optional) (!has_value(optional))
 
-
-typedef unsigned int size_t;
+// define some type aliases that only contain ascii character
+// they are used in the name of the struct optional_<name>
 typedef void* voidptr;
 typedef ProcessControlBlock* pcbptr;
+// size_t is another standard type
+typedef unsigned int size_t;
 
 // create optionals for required types
 CreateOptionalOfType(int);