add a warning To Node Shutdown docs on draining/decomissioning multiple nodes at once

[msbutler]

Michael Butler (msbutler) commented:

Currently there isn't any warning in the docs around decomissioning multiple nodes at once. It seems like best practice drain/decomission nodes one at a time.

( It might be worth checking with Server engineers about this as well. ) https://www.cockroachlabs.com/docs/stable/node-shutdown.html?

Jira Issue: DOC-3457

Epic DOC-11045