dox: added some missing doxygen comments

include/re_aes.h

@@ -9,6 +9,7 @@
 #define AES_BLOCK_SIZE 16
 #endif
 
+/** AES mode */
 enum aes_mode {
 	AES_MODE_CTR  /**< AES Counter mode (CTR) */
 };

src/dns/client.c

@@ -1,5 +1,5 @@
 /**
- * @file client.c  DNS Client
+ * @file dns/client.c  DNS Client
  *
  * Copyright (C) 2010 Creytiv.com
  */

src/hmac/hmac.c

@@ -1,5 +1,5 @@
 /**
- * @file hmac.c  HMAC-SHA1
+ * @file hmac/hmac.c  HMAC-SHA1
  *
  * Copyright (C) 2010 Creytiv.com
  */

src/ice/icem.c

@@ -422,6 +422,8 @@ struct list *icem_validl(const struct icem *icem)
  * Set the default local candidates, for ICE-lite mode only
  *
  * @param icem ICE Media object
+ *
+ * @return 0 if success, otherwise errorcode
  */
 int icem_lite_set_default_candidates(struct icem *icem)
 {