apply code formatting to variable name (#610)

episodes/01-starting-with-data.Rmd

@@ -278,7 +278,7 @@ and finally prints the assigned value of the variable `total_weight`.
 
 ::::::::::::::::::::::::::::::::::::::::::::::::::
 
-Now that we know how to assign things to variables, let's re-run `read.csv` and save its result into a variable called 'dat':
+Now that we know how to assign things to variables, let's re-run `read.csv` and save its result into a variable called `dat`:
 
 ```{r}
 dat <- read.csv(file = "data/inflammation-01.csv", header = FALSE)