Mention --all-cells on MoveTables/Reshard pages

[mattlord]

This documents https://github.com/vitessio/vitess/pull/14341

Shortcuts:

• MoveTables: https://deploy-preview-1625--vitess.netlify.app/docs/19.0/reference/vreplication/movetables/#--cells
• Reshard: https://deploy-preview-1625--vitess.netlify.app/docs/19.0/reference/vreplication/reshard/#--cells

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