Warn against Markdown links in Download component children

[fern-api]

Expanded the children ParamField description on the Download component page to explicitly warn that wrapping the click target in a Markdown link (e.g. [Download PDF](./file.pdf)) is incorrect and unnecessary — <Download> handles the link behavior itself, so plain text or a <Button> element is all that's needed.

[github-actions]

⚠️ [vale] <Microsoft.UIVerbs> _{reported by reviewdog 🐶}
Use 'select' instead of the input-specific verb 'click'.

[github-actions]

🚫 [vale] <Microsoft.Contractions> _{reported by reviewdog 🐶}
Use 'don't' instead of 'Do not'.

Suggested change

	The text or element to display as the click target for the download. Can be plain text (e.g. `Download PDF`) or a React element such as a `<Button>`. Do not wrap the text in a Markdown link (e.g. `[Download PDF](./file.pdf)`) — `<Download>` handles the link behavior itself, so a Markdown link is both incorrect and unnecessary.
	The text or element to display as the click target for the download. Can be plain text (e.g. `Download PDF`) or a React element such as a `<Button>`. don't wrap the text in a Markdown link (e.g. `[Download PDF](./file.pdf)`) — `<Download>` handles the link behavior itself, so a Markdown link is both incorrect and unnecessary.

[github-actions]

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Here are the markdown pages you've updated:

• learn/docs/writing-content/components/download