Docs: Outdated section `Configure vtadmin`

[erikschul]

Overview of the Issue

https://vitess.io/docs/21.0/reference/vtadmin/operators_guide/#2-configure-vtadmin

File does not exist:

• https://github.com/vitessio/vitess/blob/main/examples/local/scripts/vtadmin-up.sh
• https://github.com/vitessio/vitess/blob/main/examples/local/vtadmin/discovery.json

Reproduction Steps

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Binary Version

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Operating System and Environment details

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Log Fragments

No response