Removed header limits for custom fields

[Sahidya]

Removed the following lines from Limitations on Custom Fields documentation

• You can configure up to 40 custom fields across all field types (HTTP request headers, HTTP response headers, and cookies) per zone.
• The maximum length of custom field data for HTTP request headers, Cookies, and HTTP response headers combined is 8 KB. Any data over this limit will be truncated.

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PR Change Summary

Removed header limits for custom fields in the documentation.

• Eliminated the limit on the number of custom fields per zone.
• Removed the maximum length restriction for custom field data.

Modified Files

• src/content/docs/logs/reference/custom-fields.mdx

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