docs: show availableUntil in deprecated rule banner

[Pixel998]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[x] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

• Updated rules_meta.json to reflect the new removal version (v11.0.0) for deprecated formatting rules.
• Switched <b> to <strong> for semantic emphasis in the deprecation banner.
• Updated the documentation layout template so that the deprecation banner now displays the availableUntil version when present, e.g.:

This rule was deprecated in ESLint v8.53.0. It will be removed in v11.0.0. Please use the corresponding rule in @stylistic/eslint-plugin.

Closes #20165

Is there anything you'd like reviewers to focus on?

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[kecrily]

LGTM

[mdjermanovic]

LGTM, thanks!