[master] Docs: fix all the warnings

YEAH !

(virtualenvDirac) [chaen@pclhcb31 docs]$ make clean && make html
rm -rf build/*
sphinx-build -b html -d build/doctrees   source build/html
Running Sphinx v1.7.3
making output directory...
loading pickled environment... not yet created
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 31 source files that are out of date
updating environment: 31 added, 0 changed, 0 removed
reading sources... [100%] index                                                                                                                                                                                    
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] index                                                                                                                                                                                     
generating indices... genindex
writing additional pages... search
copying images... [100%] Certification/images/req19.png                                                                                                                                                            
copying downloadable files... [100%] AdministratorGuide/BOINC/cfgTemplates/dirac.cfg                                                                                                                               
copying static files... done
copying extra files... done
dumping search index in English (code: en) ... done
dumping object inventory... done
build succeeded.

The HTML pages are in build/html.

Build finished. The HTML pages are in build/html.