[FABG-801] fix stale function comment

Comment on NewQueryHandler/NewExecuteHandler seems obsolete.
So let's fix it.

Change-Id: I9037fe431183d44b4bf53beba2e88a1ecbc2161b
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>

pkg/client/channel/invoke/txnhandler.go

@@ -202,7 +202,7 @@ func (c *CommitTxHandler) Handle(requestContext *RequestContext, clientContext *
 	}
 }
 
-//NewQueryHandler returns query handler with EndorseTxHandler & EndorsementValidationHandler Chained
+//NewQueryHandler returns query handler with chain of ProposalProcessorHandler, EndorsementHandler, EndorsementValidationHandler and SignatureValidationHandler
 func NewQueryHandler(next ...Handler) Handler {
 	return NewProposalProcessorHandler(
 		NewEndorsementHandler(
@@ -213,7 +213,7 @@ func NewQueryHandler(next ...Handler) Handler {
 	)
 }
 
-//NewExecuteHandler returns query handler with EndorseTxHandler, EndorsementValidationHandler & CommitTxHandler Chained
+//NewExecuteHandler returns execute handler with chain of SelectAndEndorseHandler, EndorsementValidationHandler, SignatureValidationHandler and CommitHandler
 func NewExecuteHandler(next ...Handler) Handler {
 	return NewSelectAndEndorseHandler(
 		NewEndorsementValidationHandler(