Fix typo in comment

Author: terrillmoore

src/lmic/lmic.h

@@ -686,7 +686,7 @@ bit_t LMIC_enableChannel(u1_t channel);
 bit_t LMIC_disableSubBand(u1_t band);
 bit_t LMIC_selectSubBand(u1_t band);
 
-//! \brief get the number of (fixed) default channels before the progammable channels.
+//! \brief get the number of (fixed) default channels before the programmable channels.
 u1_t  LMIC_queryNumDefaultChannels(void);
 
 //! \brief check whether the LMIC is ready for a transmit packet