docs(snippets): fix download form errors
docs(snippets): fix download form errors

The download form snippet was incorrect as it had the `headline` and `description` fields from Drip outside the form when they needed to be inside the form for the drip widget to dynamically update them.

andrewconnell/aci-orchardcms,andrewconnell/aci-orchardcms,andrewconnell/aci-orchardcms,andrewconnell/aci-orchardcms