Bookmark button tooltips

[james-rae]

Describe the bug

I'm not smart enough to know if this is actual violation, best practice, or just me being a 🦀 .

When opening the Share Map display, the three buttons to the right are titled Copy, Update link, Hide. If I was screen-reading I'd be like "Copy what?". Maybe its obvious since a textbox titled Share map is right before it. But I'd suggest Copy link and Hide link if we want to change it.