[2836] Minor docs fixes

src/lib/datasrc/memory/zone_data_loader.cc

@@ -131,7 +131,7 @@ ZoneDataLoader::flushNodeRRsets() {
     }
 
     // Normally rrsigsets map should be empty at this point, but it's still
-    // possible that an RRSIG that don't has covered RRset is added; they
+    // possible that an RRSIG that doesn't have covered RRset is added; they
     // still remain in the map.  We add them to the zone separately.
     BOOST_FOREACH(NodeRRsetsVal val, node_rrsigsets_) {
         updater_.add(ConstRRsetPtr(), val.second);

src/lib/datasrc/memory/zone_data_loader.h

@@ -57,7 +57,7 @@ ZoneData* loadZoneData(util::MemorySegment& mem_sgmt,
 /// \c iterator.
 ///
 /// Throws \c ZoneDataUpdater::AddError if invalid or inconsistent data
-/// is present in the \c zone_file. Throws \c isc::Unexpected if empty
+/// is present in the \c iterator. Throws \c isc::Unexpected if empty
 /// RRsets are passed by the zone iterator. Throws \c EmptyZone if an
 /// empty zone would be created due to the \c loadZoneData().
 ///