\demo_node docs

[ericharmeling]

Fixes #6070.

Added syntax table and examples for cockroach demo cluster SQL \demo_node commands.

[cockroach-teamcity]

This change is 

[cockroach-teamcity]

Online preview: http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/2d64ad30e774359f38827508f196e322f3a16585/

Edited pages:

• v20.1/cockroach-demo.md

[otan]

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v20.1/cockroach-demo.md, line 257 at r1 (raw file):

### Shut down and restart nodes

If you start a demo cluster with multiple nodes, you can use the [`\demo_node`](cockroach-demo.html#shutting-down-and-restarting-nodes) to shut down and restart individual nodes in the demo cluster.

can you add a note this is currently experimental?
(we haven't documented it on the cli yet for this reason :))

[ericharmeling]

TFTR @otan. I added the experimental warning to the docs.

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @otan)

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v20.1/cockroach-demo.md, line 257 at r1 (raw file):

Previously, otan (Oliver Tan) wrote…

can you add a note this is currently experimental?
(we haven't documented it on the cli yet for this reason :))

Done.

[cockroach-teamcity]

Online preview: http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/b104e040f8e48f7c0fda592a6e1a9f6c91401843/

Edited pages:

• v20.1/cockroach-demo.md

[otan]

lgtm!