Update parameters_desc.md
Update parameters_desc.md
stanford-futuredata/macrobase,kexinrong/macrobase,stanford-futuredata/macrobase,kexinrong/macrobase,stanford-futuredata/macrobase,kexinrong/macrobase,kexinrong/macrobase,kexinrong/macrobase,stanford-futuredata/macrobase,kexinrong/macrobase,kexinrong/macrobase,stanford-futuredata/macrobase