[1614] updated doxygen document for masterLoad as suggested in review.

src/lib/dns/masterload.h

@@ -206,8 +206,8 @@ typedef boost::function<void(RRsetPtr)> MasterLoadCallback;
 /// - We may want to support incremental loading.
 /// - If we add these optional features we may want to introduce a class
 ///   that encapsulates loading status and options.
-/// - RRSIGs are handled separate RRsets, that is, not set within the RRset
-///   that they cover.
+/// - RRSIGs are handled as separate RRsets, i.e. they are not included in
+///   the RRset they cover.
 ///
 /// \param filename A path to a master zone file to be loaded.
 /// \param origin The origin name of the zone.