Remove note about tb-nightly for mesh (#27146)
Summary:
The mesh plugin is now supported by default TensorBoard install, so removing this comment.
cc sanekmelnikov lanpa natalialunova
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27146
Differential Revision: D17717610
Pulled By: orionr
fbshipit-source-id: 516efad5b800f7261b1dc6728e798c830d88b6ca
