[jreed-doxygen] fix doxygen warnings

 warning: no matching class member found

and

explicit link request to 'Rdata' could not be resolved
(typo I think)

src/lib/dns/name.cc

@@ -700,7 +700,7 @@ Name::split(const unsigned int first, const unsigned int n) const {
 }
 
 Name
-Name::split(const unsigned level) const {
+Name::split(const unsigned int level) const {
     if (level >= getLabelCount()) {
         isc_throw(OutOfRange, "invalid level for name split (" << level
                   << ") for name " << *this);

src/lib/dns/rrset.h

@@ -478,7 +478,7 @@ public:
 
     /// \brief Return the current \c Rdata corresponding to the rdata cursor.
     ///
-    /// \return A reference to an \c rdata::::Rdata object corresponding
+    /// \return A reference to an \c rdata::Rdata object corresponding
     /// to the rdata cursor.
     virtual const rdata::Rdata& getCurrent() const = 0;