Fixed spelling errors

Fixed some spelling errors found by Lintian while checking the Debian
package of LMMS. Thanks to Patrick Winnertz for pointing out this issue.

include/AudioOutputContext.h

@@ -193,7 +193,7 @@ public:
 	 *
 	 * When working with buffer sizes greater than the default buffer size, one
 	 * big output buffer is still splitted into smaller chunks. This is
-	 * especially neccessary for automation which takes place once a buffer
+	 * especially necessary for automation which takes place once a buffer
 	 * period. Transitions would be anything else but smooth when adjusting a
 	 * control just 20 times per second. BufferFifo handles the queueing of
 	 * rendered buffers. */

include/MidiClient.h

@@ -172,7 +172,7 @@ private:
 						const MidiPort * _port );
 
 	// small helper function returning length of a certain event - this
-	// is neccessary for parsing raw-MIDI-data
+	// is necessary for parsing raw-MIDI-data
 	static Uint8 eventLength( const Uint8 _event );
 
 

include/track.h

@@ -1,5 +1,5 @@
 /*
- * track.h - declaration of classes concerning tracks -> neccessary for all
+ * track.h - declaration of classes concerning tracks -> necessary for all
  *           track-like objects (beat/bassline, sample-track...)
  *
  * Copyright (c) 2004-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>