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_client/mgcp_client.h b/include/osmocom/mgcp_client/mgcp_client.h
index 3cecb8f..19c684d 100644
--- a/include/osmocom/mgcp_client/mgcp_client.h
+++ b/include/osmocom/mgcp_client/mgcp_client.h
@@ -46,10 +46,10 @@
 /*! Structure to build a payload type map to allow the defiition custom payload
  *  types. */
 struct ptmap {
-	/*!< codec for which a payload type number should be defined */
+	/*! codec for which a payload type number should be defined */
 	enum mgcp_codecs codec;
 
-	/*!< payload type number (96-127) */
+	/*! payload type number (96-127) */
 	unsigned int pt;
 };