IT WASN'T MUCH NOTED in the popular press, and I doubt if my "Twilight" reading friends even know who he was, but T. S. Eliot's wife Valerie died last week. They were married in 1957 when the poet was sixty-eight and she was thirty. Valerie had been his secretery at the publishing house Faber & Faber for the previous seven years. She had taken a secretarial course with the expresss purpose of applying for this job. After Eliot's death in 1965, Valerie became his executor, and steadfastly refused to cooperate with would be biographers, in keeping with his wishes.