Update lab_3.md

labs/lab_3.md

@@ -195,7 +195,8 @@ using the dataframe passed to it from the previous part of the code.
 ### Transform data!
 
 We're going to be following along with the textbook "R for data science". We're working on 
-chapter 3, Data Transformation: https://r4ds.hadley.nz/data-transform
+chapter 3, Data Transformation: (https://r4ds.hadley.nz/data-transform)[https://r4ds.hadley.nz/data-transform]
+
 Important: In the tutorial, it loads "tidyverse". We have already installed and loaded
 almost all of the tidyverse packages, but due to some quirks in the server it's easier
 to use it the way listed here. So, where it says "library(tidyverse)", skip that command.