Update for Sentinel Thenysil

<name>, you have done a great deed by lending a hand here. The Sentinels of Ashenvale will reward you well if you informed them that Gaxim and I are alive. Tell them we are well on our way to stopping the Venture Co. and healing the lands. Find Tara Thenysil in Astranaar; she will be pleased to see you've returned with good news.