[R-package] [docs] Removed outdated language about the R package (#3070)
[R-package] [docs] Removed outdated language about the R package (#3070)


microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM