Share note do not trigger the scroll bar in Documentation theme

When sharing a page or a space using the Documentation Theme, if a very long text in entered in the note, the scroll bar is not triggered making the buttons, and part of the text not visible.

Repro Steps:

1. Go to a page which uses the Documentation theme
2. Click on Share
3. Enter a note with several lines of text, until ti goes out of the screen

Workaround:
You can jump to the button share by pushing the key <TAB> from the note text area.