DOC: Correct return type in docstr of synth.fts2spec
DOC: Correct return type in docstr of synth.fts2spec

necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control