Update hubspot.mdx - changing link to public facing option

[ptibben]

Summary

As-is, the referenced help link is behind a HubSpot login. While not necessarily incorrect, HubSpot has a public-facing guide as well.

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit c909fb4.

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