Update 01-getting-started.Rmd

Update CRAN website.

01-getting-started.Rmd

@@ -64,7 +64,7 @@ You will first need to download and install both R and RStudio (Desktop version)
 
 1. **You must do this first:** Download and install R by going to <https://cloud.r-project.org/>. \index{R!installation}
     + If you are a Windows user: Click on "Download R for Windows", then click on "base", then click on the Download link. 
-    + If you are macOS user: Click on "Download R for (Mac) OS X", then under "Latest release:" click on R-X.X.X.pkg, where R-X.X.X is the version number. For example, the latest version of R as of November 25, 2019 was R-3.6.1.
+    + If you are macOS user: Click on "Download R for macOS", then under "Latest release:" click on R-X.X.X.pkg, where R-X.X.X is the version number. For example, the latest version of R as of November 25, 2019 was R-3.6.1.
     + If you are a Linux user: Click on "Download R for Linux" and choose your distribution for more information on installing R for your setup.
 1. **You must do this second:** Download and install RStudio at <https://www.rstudio.com/products/rstudio/download/>.
     + Scroll down to "Installers for Supported Platforms" near the bottom of the page.
@@ -415,7 +415,7 @@ At first glance, it may not appear that there is much difference in the outputs.
 
 **4. `$` operator**
 
-Lastly, the `$` operator \index{operators!dollar sign} allows us to extract and then explore a single variable within a data frame. For example, run the following in your console
+Lastly, the `$` operator \index{operators!dollar sign} allows us to extract and then explore a single variable within a data frame. For example, run the following in your console:
 
 ```{r eval=FALSE}
 airlines$name