[CF1] custom block dialogs rbi

[deadlypants1973]

Summary

PCX-16380

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
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PR Change Summary

Introduced custom block dialogs feature for enhanced user guidance during blocked actions in Browser Isolation.

• Added a new section on custom block dialogs in the isolation policies documentation.
• Outlined the configuration options for custom block dialogs, including query parameters.
• Noted that custom block dialogs are currently in beta.

Modified Files

• src/content/docs/cloudflare-one/policies/browser-isolation/isolation-policies.mdx

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[github-actions]

Preview URL: https://44921feb.preview.developers.cloudflare.com
Preview Branch URL: https://kate-fixes-customblock.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/policies/browser-isolation/isolation-policies/	https://kate-fixes-customblock.preview.developers.cloudflare.com/cloudflare-one/policies/browser-isolation/isolation-policies/