docs: document original tokens header

[iruizsalinas]

I was testing Markdown for Agents on my website and noticed responses include an x-original-tokens header alongside x-markdown-tokens. I could not find x-original-tokens mentioned in the docs, so this adds a small note for it.

[cloudflare-docs-bot]

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💡 1 suggestion found in commit 53f459d.

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File	Issue
fundamentals/reference/markdown-for-agents.mdx line 81	LLM-filler phrases — Line starts with 'Note that' Fix: Remove the filler and state the fact directly: 'We include token count headers with the converted response.'

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