I wanted to throw an opinion out there for the Tooltip Invitation
pattern to never include the words "Click to" as in "Click to edit".
If you need to include the words "click to" I think it's indicating an
underlying problem. It should be obvious to the user what is
clickable. This can usually be achieved by making an element look like
either a hyperlink or form field or with hover effects.

In this sense the tooltip should not be an invitation but an
explanation designed to reduce any uncertainly the user may have about
how the application will behave once an element is clicked.

In the example you provided, the tooltip text of simply "Edit" would
be sufficient provided the editable region appeared to be interactable
by clicking.

Ollie
http://olliesaunders.net/