minor tidy up of none relation query method

activerecord/lib/active_record/relation/query_methods.rb

@@ -206,8 +206,8 @@ def lock(locks = true)
     # Any subsequent condition chained to the returned relation will continue
     # generating an empty relation and will not fire any query to the database.
     #
-    # Used in cases where is needed a method or a scope that could return zero
-    # results but the response has to be chainable.
+    # Used in cases where a method or scope could return zero results but the
+    # response needs to be chainable.
     #
     # For example:
     #