It appears the documentation is LGPL.
LGPL doesn't make a lot of sense for documentation, it refers to binaries and linking and source code which don't really apply (the Gnu FDL or Free Documentation License is what is intended to apply)
So what makes you think the documentation is licensed under LGPL? Is there actually any place on the website that explicitly says terms that the documentation may be licensed under? If not, is there any place that declares whether contributors to the documentation are disclaiming copyright or licensing it to pygame or anything?