Adjust the ToC in the online version of the Scrum Guide (UI-bug)
UI-Bug: In Firexox (48.0.1) and Chrome ( 53.0.2785.116) the left menu is not 'sticky enough'.
To reproduce: scroll down to the end of the document.
Current behavior: the ToC doesn't stay within the left menu box.
Expected behavior: the ToC stays within the left menu box.