[Rules] Update create-dashboard.mdx

[nenizera]

Hello team,

Summary

Customers are facing UI errors while attempting to create Lists with source URLs + query string.

Query string is not supported in the Source URL.

Per https://developers.cloudflare.com/rules/url-forwarding/bulk-redirects/reference/url-components/

Thanks!

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PR Change Summary

Updated the documentation for creating dashboards to clarify that query strings are not supported in the Source URL.

• Added a note regarding the unsupported query strings in Source URLs.
• Updated the documentation to reference supported URL components.

Modified Files

• src/content/docs/rules/url-forwarding/bulk-redirects/create-dashboard.mdx

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