[rtler] minor updates to the vbase docstrings
[rtler] minor updates to the vbase docstrings

cfelton/pymtl,Glyfina-Fernando/pymtl,12yujim/pymtl,jck/pymtl,cfelton/pymtl,jck/pymtl,Abhinav117/pymtl,jck/pymtl,12yujim/pymtl,jjffryan/pymtl,Abhinav117/pymtl,cornell-brg/pymtl,jjffryan/pymtl,cfelton/pymtl,12yujim/pymtl,tj93/pymtl,cornell-brg/pymtl,tj93/pymtl,jjffryan/pymtl,Abhinav117/pymtl,tj93/pymtl,Abhinav117/pymtl,cornell-brg/pymtl,Glyfina-Fernando/pymtl,Glyfina-Fernando/pymtl