cosmetic: fix doxygen comment markers

There has obviously been a misunderstanding on how the doxygen comments work.
A comment marked '<' is for placing a comment *after* a member, to point back
to the item before it, typically

  enum foo {
  	thing, /*!< this is a thing */
	a_bobby,
  }

It does not make sense to place these above the item they are describing.

We actually don't use doxygen in the osmo-mgw build, but if we have doxygen
syntax, we might as well have the correct one.

Change-Id: I9e8ea0e3bd5ae5fcc0a6fae8e26e11baa8f35e27
diff --git a/include/osmocom/mgcp/mgcp_internal.h b/include/osmocom/mgcp/mgcp_internal.h
index b564905..7712593 100644
--- a/include/osmocom/mgcp/mgcp_internal.h
+++ b/include/osmocom/mgcp/mgcp_internal.h
@@ -221,33 +221,33 @@
 
 /*! MGCP connection (untyped) */
 struct mgcp_conn {
-	/*!< list head */
+	/*! list head */
 	struct llist_head entry;
 
-	/*!< Backpointer to the endpoint where the conn belongs to */
+	/*! Backpointer to the endpoint where the conn belongs to */
 	struct mgcp_endpoint *endp;
 
-	/*!< type of the connection (union) */
+	/*! type of the connection (union) */
 	enum mgcp_conn_type type;
 
-	/*!< mode of the connection */
+	/*! mode of the connection */
 	enum mgcp_connection_mode mode;
 
-	/*!< copy of the mode to restore the original setting (VTY) */
+	/*! copy of the mode to restore the original setting (VTY) */
 	enum mgcp_connection_mode mode_orig;
 
-	/*!< connection id to identify the connection */
+	/*! connection id to identify the connection */
 	char id[MGCP_CONN_ID_LENGTH];
 
-	/*!< human readable name (vty, logging) */
+	/*! human readable name (vty, logging) */
 	char name[256];
 
-	/*!< union with connection description */
+	/*! union with connection description */
 	union {
 		struct mgcp_conn_rtp rtp;
 	} u;
 
-	/*!< pointer to optional private data */
+	/*! pointer to optional private data */
 	void *priv;
 };