[Issue]: Clarify that elastic stack label applies to all deployment types (all other than serverless)

[shainaraskas]

Type of issue

Other

What documentation page is affected

https://www.elastic.co/docs/get-started/versioning-availability

What happened?

"Elastic Stack" is perceived to refer to "Self-managed" elasticsearch. We can clarify what "elastic stack" refers to on the versioning page

Also requested: tooltips

Additional info

No response