fix URL and document

Author: PhilippBach

DoubleML.Rproj

@@ -15,4 +15,4 @@ LaTeX: pdfLaTeX
 BuildType: Package
 PackageUseDevtools: Yes
 PackageInstallArgs: --no-multiarch --with-keep.source
-PackageCheckArgs: --no-tests --run-donttest
+PackageCheckArgs: --as-cran --no-tests --run-donttest

R/double_ml_plr.R

@@ -278,7 +278,7 @@ DoubleMLPLR = R6Class("DoubleMLPLR",
     #' in the [mlr3tuning](https://mlr3tuning.mlr-org.com/) package. For more
     #' information on tuning in [mlr3](https://mlr3.mlr-org.com/), we refer to
     #' the section on parameter tuning in the
-    #' [mlr3 book](https://mlr3book.mlr-org.com/optimization.html#tuning).
+    #' [mlr3 book](https://mlr3book.mlr-org.com/chapters/chapter4/hyperparameter_optimization.html).
     #'
     #' @param param_set (named `list()`) \cr
     #' A named `list` with a parameter grid for each nuisance model/learner