docs: use branin_wu function in examples (#98)

Author: be-marc

DESCRIPTION

@@ -41,7 +41,7 @@ Depends:
     mlr3tuning (>= 0.13.0),
     R (>= 3.1.0)
 Imports:
-    bbotk (>= 0.5.2),
+    bbotk (>= 0.7.0),
     checkmate (>= 1.9.4),
     data.table,
     lgr,
@@ -56,6 +56,8 @@ Suggests:
     rpart,
     testthat (>= 3.0.0),
     xgboost
+Remotes:
+    mlr-org/bbotk@release
 Config/testthat/edition: 3
 Config/testthat/parallel: true
 Encoding: UTF-8

man-roxygen/example_optimizer.R

@@ -9,9 +9,12 @@
 #'   fidelity = p_dbl(1e-2, 1, tags = "budget")
 #' )
 #'
-#' # objective with modified branin function, see `bbotk::branin()`
+#' # Branin function with fidelity, see `bbotk::branin()`
+#' fun = function(xs) branin_wu(xs[["x1"]], xs[["x2"]], xs[["fidelity"]])
+#'
+#' # create objective
 #' objective = ObjectiveRFun$new(
-#'   fun = branin,
+#'   fun = fun,
 #'   domain = domain,
 #'   codomain = ps(y = p_dbl(tags = "minimize"))
 #' )