clean up _parse_function_doc a little bit, #298
clean up _parse_function_doc a little bit, #298

WoLpH/jedi,tjwei/jedi,WoLpH/jedi,jonashaag/jedi,mfussenegger/jedi,dwillmer/jedi,tjwei/jedi,dwillmer/jedi,jonashaag/jedi,mfussenegger/jedi,flurischt/jedi,flurischt/jedi