[Turnstile] Fix free turnstile widget count

[patriciasantaana]

Summary

Closes #22551

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated the free turnstile widget limit for users.

• Increased the limit of free widgets per account from 10 to 20.
• Clarified the availability of widget limits for enterprise users.

Modified Files

• src/content/docs/turnstile/concepts/widget.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/turnstile/	@migueldemoura, @punkeel, @worenga, @patriciasantaana, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://72688100.preview.developers.cloudflare.com
Preview Branch URL: https://patricia-pcx17520-widget-count-update.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/turnstile/concepts/widget/	https://patricia-pcx17520-widget-count-update.preview.developers.cloudflare.com/turnstile/concepts/widget/