Add doc on model memory usage (#1887)
* Doc
* Note on meta
* Phrase
* Apply suggestions from code review
Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>
* Clarity nit
* Nits
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Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>
