docstring fix
docstring fix

RexFuzzle/sfepy,RexFuzzle/sfepy,vlukes/sfepy,olivierverdier/sfepy,lokik/sfepy,vlukes/sfepy,sfepy/sfepy,rc/sfepy,BubuLK/sfepy,rc/sfepy,lokik/sfepy,lokik/sfepy,sfepy/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,lokik/sfepy,olivierverdier/sfepy,rc/sfepy,sfepy/sfepy,olivierverdier/sfepy,BubuLK/sfepy,vlukes/sfepy