[trac639] minor editorial fixes

src/lib/cache/TODO

@@ -12,8 +12,8 @@
 * When the rrset beging updated is an NS rrset, NSAS should be updated
   together.
 * Share the NXDOMAIN info between different type queries. current implementation
-  can only cache for the type that user quired, for example, if user query A
+  can only cache for the type that user queried, for example, if user query A
   record of a.example. and the server replied with NXDOMAIN, this should be
   cached for all the types queries of a.example.
-* Add the interfaces for resizing and serialization(loading and dumping) to
+* Add the interfaces for resizing and serialization (loading and dumping) to
   cache.