Assorted spelling fixes.
diff --git a/include/mmsystem.h b/include/mmsystem.h
index 37373e4..bb13cfd 100644
--- a/include/mmsystem.h
+++ b/include/mmsystem.h
@@ -476,7 +476,7 @@
 
 #ifndef _WAVEFORMATEX_
 #define _WAVEFORMATEX_
-/* dito same for Win16 / Win32 */
+/* ditto same for Win16 / Win32 */
 typedef struct tWAVEFORMATEX {
     WORD	wFormatTag;
     WORD	nChannels;