Merge pull request #4120 from cgundogan/pr/gnrc_ipv6_nc/doc_fix_minor

nc: minor doc fix

sys/include/net/gnrc/ipv6/nc.h

@@ -147,7 +147,7 @@ typedef struct {
     vtimer_t nbr_adv_timer;
 
 #ifdef MODULE_GNRC_SIXLOWPAN_ND_ROUTER
-    vtimer_t type_timeout;                  /**< Timer for type transissions */
+    vtimer_t type_timeout;                  /**< Timer for type transmissions */
     eui64_t eui64;                          /**< the unique EUI-64 of the neighbor (might be
                                              *   different from L2 address, if l2_addr_len == 2) */
 #endif