Merge pull request #840 from datacarpentry/ErinBecker-patch-1

Update 04-visualization-ggplot2.Rmd

Author: ErinBecker

04-visualization-ggplot2.Rmd

@@ -515,7 +515,7 @@ provides a wide variety of options.
 
 ## Customization
 
-Take a look at the [**`ggplot2`** cheat sheet](https://raw.githubusercontent.com/rstudio/cheatsheets/main/data-visualization-2.1.pdf), and
+Take a look at the [**`ggplot2`** cheat sheet](https://posit.co/wp-content/uploads/2022/10/data-visualization-1.pdf), and
 think of ways you could improve the plot.
 
 Now, let's change names of axes to something more informative than 'year'
@@ -591,7 +591,7 @@ ggplot(surveys_complete, aes(x = species_id, y = hindfoot_length)) +
 >
 > With all of this information in hand, please take another five minutes to either
 > improve one of the plots generated in this exercise or create a beautiful graph
-> of your own. Use the RStudio [**`ggplot2`** cheat sheet](https://www.rstudio.com/wp-content/uploads/2016/11/ggplot2-cheatsheet-2.1.pdf)
+> of your own. Use the RStudio [**`ggplot2`** cheat sheet](https://posit.co/wp-content/uploads/2022/10/data-visualization-1.pdf)
 > for inspiration.
 >
 > Here are some ideas: