docs: update config yaml models link

[lin-hongkuan]

Summary

Update the generated config.yaml example comment to point to the current models customization docs URL.

Motivation

The starter config currently links to /customization/models, while the current docs path is /customize/models. This can send new users to a stale URL from the generated config template.

Fixes #12669

Changes

• Replace the stale models documentation URL in core/config/createNewAssistantFile.ts.

Testing

• Verified the old URL no longer appears in the file and the new URL does.
• git diff --check
• Prettier check on the touched file with an equivalent temporary config excluding unavailable local plugins.
• Secret scan on diff: clean

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Summary by cubic

Fixes the models docs link in the generated config.yaml comment so new configs point to the current docs. Replaces /customization/models with /customize/models in core/config/createNewAssistantFile.ts.

^{Written for commit 15a520c. Summary will update on new commits.}

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