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runtime-overview.md tweaks (#636)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/636

Add a couple commas to make a sentence easier to read

Reviewed By: JacobSzwejbka

Differential Revision: D49959696

fbshipit-source-id: af22dc37b5d4ca5c2b823bf60fefcb4db0c2d415
D
Dave Bort committed
de3c0247bf3db3a9272796c8e449b9433a213a52
Parent: 974e2e3
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 10/5/2023, 6:00:48 PM