knobs.c: fix the brief description

src/knobs.c

@@ -19,7 +19,7 @@
  * @file   knobs.c
  * @author Ioannis Koutras (joko@microlab.ntua.gr)
  * @date   November 2012
- * @brief  Knobs initialization routine.
+ * @brief  Knobs initialization and configuration routines.
  */
 
 #include "dmm_config.h"