I would like to make a simple request to the writers of the User Manual:
It would be really nice to have the revision number listed inside the file so its identifiable on hard copy. Maybe just a line on the title page or ideally a footer on each page with revision and page number.
And also a big Thank You just for making the User Manual in the first place! 
We can definitely add that back in, and probably should. The PDF you download is named according to the version of xLights that it covers. Not sure if anyone knows or has even noticed, but in the installation section for the Macintosh, I always replace the image showing the version number we are covering in the manual too.
Gerry is working hard currently adding/correcting content for the next release. After that, we're porting the manual back over to Office from Google. We'll gain a true TOC and start adding code for a index (little by little). I want to get page numbers back into the manual again too.