feat: Add advanced localization example

[jeremy-clerk]

Important

🔎 Previews:

• https://clerk.com/docs/pr/1906/customization/localization#advanced-usage

Explanation:

• Adds how to update localization using Clerk.__unstable__updateProps()
• There can be confusion on how to update only a few properties of an imported localization, this helps address that.
• https://linear.app/clerk/issue/DOCS-9676/feedback-for-customizationlocalization
• https://linear.app/clerk/issue/DOCS-9448/feedback-for-customizationlocalization

This PR:

• Adds an example with warnings and caveats about using the __unstable__updateProps() method.
• Adds how to change values of an imported localization
• Gives an advanced example with type safety and update function for multiple values.

Checklist

• I have clicked on "Files changed" and performed a thorough self-review
• I have added the "deploy-preview" label and added the preview link(s) to this PR description
• All existing checks pass

[github-actions]

Hey, here’s your docs preview: https://clerk.com/docs/pr/1906