mgcp_e1: fix apidoc

Change-Id: Iaccb9b67e72d113483160e61f660ea9c4c2f53a5
diff --git a/src/libosmo-mgcp/mgcp_e1.c b/src/libosmo-mgcp/mgcp_e1.c
index 9a6efe2..7f30c1d 100644
--- a/src/libosmo-mgcp/mgcp_e1.c
+++ b/src/libosmo-mgcp/mgcp_e1.c
@@ -496,7 +496,7 @@
 	}
 }
 
-/* !Equip E1 endpoint with I.460 mux resources.
+/*! Equip E1 endpoint with I.460 mux resources.
  *  \param[in] endp endpoint to equip
  *  \param[in] ts E1 timeslot number.
  *  \param[in] ss E1 subslot number.