putting a pdf version is going to be useful and time saving for many people. Don't you think?
I don't see how it's much more timesaving than just downloading the online tutorials for off-line viewing.
It takes (literally) 5 seconds to do:
$ time wget --mirror --convert-links --adjust-extension --page-requisites --no-parent http://www.sfml-dev.org/tutorials/2.2/
...
real 0m5.235s
user 0m0.043s
sys 0m0.046s
and then you can just launch a browser on your local copy:
$ firefox file://$(pwd)/www.sfml-dev.org/tutorials/2.2/index.html