fix dox warnings

src/core/command-line.h

@@ -56,7 +56,7 @@ public:
    * \brief Add a command line triggered function call to the system
    * \param name Name of the string to expect on the command line
    * \param help A help string for this param, displayed --help is used.
-   * \param value An ns3::Callback that gets called if name is present as a
+   * \param cb An ns3::Callback that gets called if name is present as a
    * commandline argument.
    */
   static void AddArgCommand (const std::string &name,

src/devices/p2p/p2p-topology.h

@@ -44,7 +44,7 @@ public:
   /** 
    * \param n1 INode
    * \param n2 INode
-   * \param rate Maximum transmission link rate 
+   * \param dataRate Maximum transmission link rate 
    * \param delay one-way propagation delay 
    * \return Pointer to the underlying PointToPointChannel
    *