The section "Tool Help" starts with the question mark icon on a new line, all by itself. This can give the user the impression that there is a missing image or element here, rather than the reality which is it's showing you the help icon.
The linked PR refactors the markup to inline the image:
"... the Help icon ( [?] ) in the tool title bar."
The PR also removes references to /library/skin/neo-default/*, as this directory no longer exists, and re-introduces help.css as a local file in the help project to improve the look and feel of the help content.