set eval to false for shiny code

vignettes/qenv.Rmd

@@ -145,11 +145,10 @@ These functions can be seamlessly integrated into `shiny` applications to produc
 
 When employing a `qenv` to evaluate code, should an error occur, an object of type `qenv.error` is generated. This object can be utilized wherever a `qenv` object is used, alleviating the need for code alterations to handle these errors. Select the `error_option` in the example below to witness `qenv` error handling in action.
 
-```{r}
+```{r, eval=FALSE}
 library(shiny)
-library(magrittr)
 # create an initial qenv with the data in
-data_q <- qenv() %>% eval_code("iris_data <- iris")
+data_q <- qenv() |> eval_code("iris_data <- iris")
 
 ui <- fluidPage(
   radioButtons(