Alex Trebek says he’s “feeling great.” The Jeopardy host has been undergoing treatment for stage-4 pancreatic cancer.  He just  posted an update and he says his treatment is paying off and that “my numbers are good.”  Trebek has been writing a memoir while the show’s on break.  His memoir will be released this summer.   He also says  “Jeopardy” is opening the vaults, and will air classic episodes . . . including his first ever.