update docs for mult-root info
update docs for mult-root info

CuteSephiroth/swig,cgvarela/swig,zongkelong/swig,paularmstrong/swig,Lochlan/swig,mrazvan92/swig-template-callback,CuteSephiroth/swig,mahdaen/swig,genify/swig,cwhatley/swig,jrvldam/swig,cwhatley/swig,jerrylin1002/swig,benpptung/swig,DragWeb/swig,cwhatley/swig,gogobook/swig,mrazvan92/swig-template-callback,gold3bear/swig,cgvarela/swig,notthetup/swig,Thunf/swiger,gold3bear/swig,mrazvan92/swig-async,jerrylin1002/swig,CuteSephiroth/swig,gitoneman/swig,mrazvan92/swig-async,notthetup/swig,gitoneman/swig,Thunf/swiger,xiaoyang2022/swig,xiaoyang2022/swig,jrvldam/swig,cgvarela/swig,notthetup/swig,zetlen/swig,gitoneman/swig,zetlen/swig,Lochlan/swig,benpptung/swig,gogobook/swig,gogobook/swig,benpptung/swig,paularmstrong/swig,zetlen/swig,paularmstrong/swig,jerrylin1002/swig,zongkelong/swig,genify/swig,zongkelong/swig,DragWeb/swig,genify/swig,mahdaen/swig,Lochlan/swig,DragWeb/swig,mrazvan92/swig-template-callback,jrvldam/swig,mrazvan92/swig-async,Thunf/swiger,mahdaen/swig,xiaoyang2022/swig,gold3bear/swig