olsr: fix doxygen warnings

src/olsr/helper/olsr-helper.h

@@ -49,8 +49,10 @@ public:
   /**
    * \brief Construct an OlsrHelper from another previously initialized instance
    * (Copy Constructor).
+   *
+   * \param o object to copy
    */
-  OlsrHelper (const OlsrHelper &);
+  OlsrHelper (const OlsrHelper &o);
 
   /**
    * \returns pointer to clone of this OlsrHelper

src/olsr/model/olsr-routing-protocol.h

@@ -351,6 +351,11 @@ public:
                            LocalDeliverCallback lcb,
                            ErrorCallback ecb);
   virtual void SetIpv4 (Ptr<Ipv4> ipv4);
+
+  /**
+   * \returns the ipv4 object this routing protocol is associated with
+   */
+  NS_DEPRECATED_3_34
   virtual Ptr<Ipv4> GetIpv4 (void) const;
   virtual void PrintRoutingTable (Ptr<OutputStreamWrapper> stream, Time::Unit unit = Time::S) const;