NeMo performance feature documentation

[erhoo82]

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[erhoo82]

Thanks, @jgerh for the suggestions.
There seem to be too many rephrases. If the changes are mainly about rewording, can you push the changes to my branch?

[jgerh]

I appreciate the feedback. I can update my edits and focus on copyediting only, rather than rephrasing.

[jgerh]

I finished the review and provided minor copyedits of the content.