[Rules]Update troubleshooting.mdx

[nenizera]

Hello team,

Summary

Per error message on CF dashboard:

Thanks.

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PR Change Summary

Updated the troubleshooting documentation to clarify the size limit for custom error pages.

• Clarified that the custom error page size limit is 1.5 MB (1500000 characters).
• Ensured that the custom error page cannot be blank.

Modified Files

• src/content/docs/rules/custom-errors/troubleshooting.mdx

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