Improve tooltip message layout for notes

[jedrzejosinski]

Whenever a user move over a "add note" button, a tooltip is dispalyed.
Currently there is a message "Click to update this ... note" with some empty space left above which does not look well:

The purpose of that one-line-space is to separate a tip from the actual note if it is added:

Let's try to improve the UX. A suggested solution is to remove that empty space and simply make a tip message visually different than a note, e.g. use two different font colors, bold vs. italic, sizes, etc.

[malaskowski]

Fixed in #229