[1331] some trivial editorial fixes in doxygen doc.

src/lib/datasrc/client.h

@@ -271,7 +271,7 @@ public:
     /// them and they would be silently discarded. Or it might need to
     /// store them no matter what (for example a git-based data source would
     /// store journal implicitly). When the \c journaling is true, it might
-    /// require that the following update be formated as IXFR transfer
+    /// require that the following update be formatted as IXFR transfer
     /// (SOA to be removed, bunch of RRs to be removed, SOA to be added,
     /// bunch of RRs to be added, and possibly repeated). If it is false, it
     /// must not require so.

src/lib/datasrc/zone.h

@@ -440,7 +440,7 @@ public:
     ///
     /// If journaling was requested when getting this updater, it might reject
     /// to add the RRset if the squence doesn't look like and IXFR. In such
-    /// such case isc::BadValue is thrown.
+    /// case isc::BadValue is thrown.
     ///
     /// \todo As noted above we may have to revisit the design details as we
     /// gain experiences:
@@ -511,7 +511,7 @@ public:
     ///
     /// If journaling was requested when getting this updater, it might reject
     /// to add the RRset if the squence doesn't look like and IXFR. In such
-    /// such case isc::BadValue is thrown.
+    /// case isc::BadValue is thrown.
     ///
     /// \todo As noted above we may have to revisit the design details as we
     /// gain experiences: