fixed comment

libwccl/ops/rulesequence.h

@@ -32,11 +32,11 @@ public:
 	 * Bool res;
 	 * res = ruleseq(sentence);
 	 * // versus
-	 * res = ruleseq.execute(sentence);
+         * res = ruleseq.execute_once(sentence);
 	 * // or if you have a pointer...
 	 * res = (*ruleseq_ptr)(sentence);
 	 * // versus
-	 * res = ruleseq_ptr->execute(sentence);
+         * res = ruleseq_ptr->execute_once(sentence);
 	 * \endcode
 	 */
 	Bool operator()(const boost::shared_ptr<Corpus2::Sentence>& sentence);