fix docstrings to have nicer autogen documentation
fix docstrings to have nicer autogen documentation

pedrobaeza/openupgradelib,hbrunn/openupgradelib,kurkop/openupgradelib,bwrsandman/openupgradelib,StefanRijnhart/openupgradelib,OCA/openupgradelib,blaggacao/openupgradelib,sebalix/openupgradelib