Removed limitation on transformed headers

[Sahidya]

Summary

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

Removed limitations on transformed headers in the logging documentation, allowing for more flexible logging configurations.

• Updated documentation to reflect the removal of limitations on transformed headers.
• Clarified that both request and response headers can now be logged as raw or transformed values.
• Adjusted notes and instructions for enabling custom fields in logs.

Modified Files

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

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