Updating the index compatibility range with 9.x variables

[yetanothertw]

Fixes #3599

Summary

This PR's updating the index compatibility table to include 8.19 for the latest 8.x release.

As per the request in the issue, I've swapped the columns so that the 9.x is the first column (for visibility/prominence).

Also, I've added variables to replace the 9.0 column with a 9.0-9.latest range.

Preview is available here:
PREVIEW

The overall table looks like this now:

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

[github-actions]

✅ Vale Linting Results

No issues found on modified lines!

[github-actions]

🔍 Preview links for changed docs

• deploy-manage/tools/snapshot-and-restore.md

[wajihaparvez]

LGTM! Just one suggestion 😄

[shainaraskas]

there should be a {{version.stack.base}}–{{version.stack}} row too so we can document 9-9 compatibility

[yetanothertw]

Thanks, adding row in a new commit.

[shainaraskas]

this was a problem before, but is the label in the corner for the column or the rows?

[yetanothertw]

this was a problem before, but is the label in the corner for the column or the rows?

It is a bit awkward alright, but this is how it reads (the label is a header for the entire 1st column):

@shainaraskas any ideas how to make it less awkward to interpret? Maybe I can open a separate issue for that.

[shainaraskas]

@yetanothertw I don't think there's a fix for it in a simple markdown table, unfortunately. feel free to just leave it alone.