Update docs around mixing hf scheduler with deepspeed optimizer

[dwyatte]

What does this PR do?

Looks like the docs around mixing and matching deepspeed optimizers with HF schedulers were not updated with #25863. I think there's probably an analogous update to make in accelerate

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@muellerzr, @pacman100

[pacman100]

Thank you @dwyatte for fixing the docs! ✨

[amyeroberts]

Thanks for updating!