[3221] Fixed doxygen errors, removed commented include

Fixed a couple doxgyen errors and removed the commented
out include of ioctl.h in d2_upd_unittest.cc

src/lib/dhcp_ddns/ncr_msg.h

@@ -72,7 +72,7 @@ enum NameChangeFormat {
 
 /// @brief Function which converts labels to  NameChangeFormat enum values.
 ///
-/// @param format_str text to convert to an enum.
+/// @param fmt_str text to convert to an enum.
 /// Valid string values: "JSON"
 ///
 /// @return NameChangeFormat value which maps to the given string.

src/lib/dhcpsrv/d2_client.h

@@ -417,8 +417,6 @@ public:
     /// transmitting requests, though any queued requests remain queued.
     /// Attempts to queue additional requests via sendRequest will fail.
     ///
-    /// @param io_service IOService to be used for sender IO event processing
-    ///
     /// @throw D2ClientError if sender instance is null. Underlying layer
     /// may throw NCRSenderExceptions exceptions.
     void stopSender();

src/lib/dhcpsrv/tests/d2_udp_unittest.cc

@@ -28,7 +28,6 @@
 #include <gtest/gtest.h>
 
 #include <sys/select.h>
-//#include <sys/ioctl.h>
 
 using namespace std;
 using namespace isc::dhcp;