[DOCS] Re-enable response console capabilities UI context

[joepeeples]

Description

elastic/kibana#138662 added an icon indicator for unsupported commands in the response console, but elastic/kibana#140518 removed it from 8.5.0.

https://github.com/elastic/security-team/issues/5161 intends to re-enable this feature in 8.6.0. Refer also to #2536 (comment).

I had already drafted docs for the feature, so we can just use that:

If the endpoint is running an older version of {agent}, some response actions may not be supported, as indicated by an informational icon and tooltip. {fleet-guide}/upgrade-elastic-agent.html[Upgrade {agent}] on the endpoint to add support for the latest response actions.

[role="screenshot"]
image::images/response-console-unsupported-command.png[Unsupported response action with tooltip,50%]

[joepeeples]

This change isn't relevant to 8.6, since there are no new commands that would not be supported by older Agent versions. Changing version label from 8.6 to 8.7.