Don't recommend the usage of next/link without href on docs

[lfades]

This section in docs: https://nextjs.org/docs/api-reference/next/link#using-a-component-that-supports-onclick shows how Link can be used without href, however adding links without href is not recommended at all. Removing that section should be enough as use cases using a tag other than a are already covered in other sections of the same page.

[balazsorban44]

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