disk.h: minor: improve comment

Author: rizlik

include/disk.h

@@ -25,7 +25,7 @@
 #include <stdint.h>
 #include "gpt.h"
 
-/* cap DISK I/O write operation to a reasonable size */
+/* cap DISK I/O read/write operation to a reasonable size */
 #define DISK_IO_MAX_SIZE 0x7FFFFFFFUL
 
 #ifndef MAX_PARTITIONS