It appears that some of the manuals are printed in Orange Font. Please note that this was a mistake at the printing press. A .pdf version of the manual is offered on the official Unreal Tournament 2003 website. You will need to have a version of Adobe® Acrobat Reader installed.
News source: Unreal Tournament 2003 website
Download: UT2K3 manual (to save: Right Click, Save Target As)