improve commentary (cosmetic)

src/ua_securechannel.c

@@ -13,7 +13,7 @@ UA_ByteString UA_Connection_completeMessages(UA_Connection *connection, UA_ByteS
     if(received.length == -1)
         return received;
 
-    /* concat received to the incomplete message we have */
+    /* concat the existing incomplete message with the new message */
     UA_ByteString current;
     if(connection->incompleteMessage.length < 0)
         current = received;
@@ -58,14 +58,15 @@ UA_ByteString UA_Connection_completeMessages(UA_Connection *connection, UA_ByteS
         end_pos += length;
     }
 
-    if(current.length == 0) { /* throw everything away */
+    if(current.length == 0) {
+        /* throw everything away */
         UA_String_deleteMembers(&current);
         current.length = -1;
         return current;
     }
 
-    /* retain the incomplete message at the end */
     if(end_pos == 0) {
+        /* no complete message in current */
         connection->incompleteMessage = current;
         UA_String_init(current);
     } else if(current.length != end_pos) {