fix most of doxygen warnings and errors

openair3/S1AP/s1ap_common.h

@@ -94,5 +94,5 @@ typedef int (*s1ap_message_decoded_callback)(sctp_assoc_t assoc_id, uint32_t str
  @returns void
  **/
 void s1ap_handle_criticality(S1AP_Criticality_t criticality);
-
+/** @}*/
 #endif /* S1AP_COMMON_H_ */

openair3/S1AP/s1ap_eNB.h

@@ -22,7 +22,7 @@
 #include <stdio.h>
 #include <stdint.h>
 
-/** @defgroup _s1ap_impl_ S1AP Layer Reference Implementation for eNB
+/** @defgroup _s1ap_impl_ S1AP Layer Reference Implementation
  * @ingroup _ref_implementation_
  * @{
  */