[3183] Fix bugs in the doxygen documenation for perfdhcp.

tests/tools/perfdhcp/packet_storage.h

@@ -85,7 +85,7 @@ public:
         return (storage_.empty());
     }
 
-    /// \brief Returns next packet from the storage..
+    /// \brief Returns next packet from the storage.
     ///
     /// This function returns packets sequentially (in the same order
     /// in which they have been appended). The returned packet is

tests/tools/perfdhcp/test_control.h

@@ -721,9 +721,9 @@ protected:
     /// \param socket An object representing socket to be used to send packets.
     /// \param packets_num A number of Renew packets to be send.
     ///
-    /// \param A number of packets actually sent.
+    /// \return A number of packets actually sent.
     uint64_t sendRenewPackets(const TestControlSocket& socket,
-                          const uint64_t packets_num);
+                              const uint64_t packets_num);
 
     /// \brief Send a renew message using provided socket.
     ///