Remove specific request to print output

This has caused confusion in the past and we now cover it by telling
students up front that we need assignments to show output.

exercises/Dplyr-shrub-volume-data-basics-R.md

@@ -14,8 +14,8 @@ If the file [`shrub-volume-data.csv`]({{ site.baseurl }}/data/shrub-volume-data.
 
 Get familiar with the data by importing it using `read.csv()` and use `dplyr` to complete the following tasks.
 
-1. Select the data from the length column and print it out (using `select`).
-2. Select the data from the site and experiment columns and print it out (using `select`).
+1. Select the data from the length column (using `select`).
+2. Select the data from the site and experiment columns (using `select`).
 3. Add a new column named `area` containing the area of the shrub, which is the length times the width (using `mutate`).
 4. Sort the data by length (using `arrange`).
 5. Filter the data to include only plants with heights greater than 5 (using `filter`).