Fix(aigw): kongctl adopt prereq

[cloudjumpercat]

Description

Fixes #issue

Preview Links

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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[Copilot]

Pull request overview

This PR updates the AI Gateway kongctl prerequisite snippets to clarify that kongctl adopt is only needed when using an existing AI Gateway (not the quickstart script), so later kongctl apply steps can manage the resource in the expected namespace.

Changes:

• Reworded the kongctl adopt ai-gateway ... prerequisite as conditional (“If you're using an existing…”) in two shared prerequisite includes.
• Adjusted the surrounding Markdown content (currently removing the ordered-list step formatting around the adopt instruction).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
app/_includes/prereqs/tools/kongctl.md	Updates the kongctl prereq include used by how-tos to make adopt conditional, but currently breaks ordered-list formatting.
app/_includes/md/ai-gateway/v2/prereqs/kongctl.md	Updates the v2 AI Gateway prereq include similarly, but currently breaks ordered-list formatting.