Tailscale funnel - enable options have changed

[weflower]

On this page:
https://docs.bluebubbles.app/server/advanced/byo-proxy-service-guides/tailscale-vpn-setup

The Add Funnel to policy button is now available only in the JSON view, which is now the non-default view for that page.

For simplicity the instructions could add a step to switch to JSON view and find the button in the right panel. Otherwise you can define a new Attribute through the new UI:

Targets: autogroup:member
Attribute: funnel
Capability:

{
	// Funnel policy, which lets tailnet members control Funnel
	// for their own devices.
	// Learn more at https://tailscale.com/kb/1223/tailscale-funnel/
	"target": ["autogroup:member"],
	"attr": ["funnel"]
}