UI: add a tip about trigger update shorcut in button tooltip

[golergka]

Describe the Feature You Want

I think a shortcut it would be more discoverable if it was mentioned in the button tooltip.

Current Behavior

Tooltip doesn't display a shortcut.

Why Do You Want This?

Even though I've used Tilt for quite some time, I wasn't aware that a shortcut to trigger update exists.

[glennpratt]

I don't think that's a great name for this button because it triggers the down/delete command first.

I'd think something like "Hard refresh"

To me, this button is a footgun for new users, I would prefer it just trigger the up/create/apply commands by default.