Documentation: add thread safety warning in API
Documentation: add thread safety warning in API

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