v1.16: docs: Removes accounts-on-ramdisk section (backport of #33655)

[mergify]

This is an automatic backport of pull request #33655 done by Mergify.
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	both modified:   docs/src/running-validator/validator-start.md

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[brooksprumo]

Closing. Turns out that docs.solana.com comes from the latest beta release, which is v1.17.

https://discord.com/channels/428295358100013066/439194979856809985/1161691512111890472