Expand documentation for data parallelism and distributed optimizer

[timmoon10]

What does this PR do ?

This expands the documentation for data parallelism and the distributed optimizer

@erhoo82 This may also be a good place to add FSDP documentation.

Collection: NLP

Changelog

• Expand documentation for data parallelism and the distributed optimizer

Usage

n/a

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Additional Information

• Matches style of NeMo Dev Doc Feature Updates 1: Some parallelisms #9184

[jgerh]

Hello, I assigned myself as a reviewer. I am the tech writer on the NeMo team and provided a review of #9184. I will make similar copyedits to the content. Thank you.

[jgerh]

I reviewed the changes and provided a few edits.

[jgerh]

I reviewed the file and added copyedits and formatting changes. Please review and implement the changes or ask me questions about the suggestions.