Annotate modification in header comment.

Example/olcSoundWaveEngine.h

@@ -150,6 +150,9 @@
 		  +CMake Compatibility
 		  =Fix wave format durations preventing playback
 		  =Various bug fixes
+
+	SIG Modifications:
+	 - Add pause flag and pause timing flags to handle pausing sound playback.
 */
 
 #pragma once