How can I use spell check in Rmarkdown?

Here are three ways to access spell checking in an rMarkdown document in rstudio:

1. A spell check button to the right of the save button (with "ABC" and a check mark).
2. Edit > Check Spelling...
3. The F7 key

A keyboard alternative to option 2 is alt + e + s. That is, while holding down the alt key, type e followed by s.