[docs] Point to the production branch of x
[docs] Point to the production branch of x

oliviertassinari/material-ui,rscnt/material-ui,mui-org/material-ui,oliviertassinari/material-ui,mui-org/material-ui,rscnt/material-ui,rscnt/material-ui,mui-org/material-ui,oliviertassinari/material-ui,lgollut/material-ui