Updates to whole game intro + dataviz chapter (#932)

* Streamline narrative for new chapters and part name

* Add to do note to add sizing for faceted plots

* Minor edits, function updates, figure alt text

* Revert references to vars() in facets, use formula

* Spell check, colo*u*r, comma after r in chunk def

* Streamline fig.alt language

* If eval = FALSE, don't need fig.alt

* Fix sentence fragment

communicate-plots.Rmd

@@ -621,6 +621,8 @@ You can learn more about `ggsave()` in the documentation.
 
 ### Figure sizing
 
+<!--# TO DO: Add something about faceted plots here. -->
+
 The biggest challenge of graphics in R Markdown is getting your figures the right size and shape.
 There are five main options that control figure sizing: `fig.width`, `fig.height`, `fig.asp`, `out.width` and `out.height`.
 Image sizing is challenging because there are two sizes (the size of the figure created by R and the size at which it is inserted in the output document), and multiple ways of specifying the size (i.e., height, width, and aspect ratio: pick two of three).
@@ -688,3 +690,4 @@ Unfortunately, the book is not available online for free, although you can find
 Another great resource is the ggplot2 extensions gallery <https://exts.ggplot2.tidyverse.org/gallery/>.
 This site lists many of the packages that extend ggplot2 with new geoms and scales.
 It's a great place to start if you're trying to do something that seems hard with ggplot2.
+