Minor doc updates in c10/core/Allocator.h (#17164)
Summary:
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17164
Differential Revision: D14154393
Pulled By: ezyang
fbshipit-source-id: 59d8276d4bb4e7cadb4382769b75e5348ed388de
