fixed a comment

tile.h

@@ -1,6 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 
 /* tile.c */
-void incmaster(const char *arg);	/* arranges all windows tiled */
+void incmaster(const char *arg);	/* inc/decreases the master width */
 void tile(void);			/* arranges all windows tiled */
 void zoom(const char *arg);		/* zooms the focused client to master area, arg is ignored */