Add an Ascii-art [before/after] diagram and fix some typos in the rescheduler README.md

[jayunit100]

This is just a starter issue to get ramped up on contributing. Its been a while since I've contributed anything to upstream :).

For this issue we'd like to:

• Update an ascii diagram of before/after a rescheduling scenario (specifically, one for the low node usage / bin packing, as thats strategic for us at this time).
• Fix some minor nits and typos in the README.md.

[ravisantoshgudimetla]

@jayunit100 - Is this something that you want to pick up? I believe the ascii part is remaining.

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

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