Fix ResNet101 naming in the Model Zoo.
Fix ResNet101 naming in the Model Zoo.

Summary:
Pull Request resolved: https://github.com/fairinternal/detectron2/pull/548

Pull Request resolved: https://github.com/facebookresearch/detectron2/pull/3172

Reviewed By: ppwwyyxx

Differential Revision: D29321232

fbshipit-source-id: ac1f3af832ca59408c43c7b9d07f39315563ac32

facebookresearch/detectron2,facebookresearch/detectron2,facebookresearch/detectron2