[Easy][FSDP] Fix warning render (#73786)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73786
If you check the `master` docs (https://pytorch.org/docs/master/fsdp.html?highlight=fsdp#module-torch.distributed.fsdp), the warning does not render due to missing a `:`.
Test Plan: Imported from OSS
Reviewed By: zhaojuanmao
Differential Revision: D34643837
Pulled By: awgu
fbshipit-source-id: cf1a3250840a3923946b5042e2939a1f05e8b490
(cherry picked from commit fef0f0be896f5605645d602ca38da19b696ac3ca)
