Remove unneeded backslash from diamonds docs (#4711)

Author: PursuitOfDataScience

R/data.R

@@ -5,7 +5,7 @@
 #'
 #' @format A data frame with 53940 rows and 10 variables:
 #' \describe{
-#'   \item{price}{price in US dollars (\$326--\$18,823)}
+#'   \item{price}{price in US dollars ($326--$18,823)}
 #'   \item{carat}{weight of the diamond (0.2--5.01)}
 #'   \item{cut}{quality of the cut (Fair, Good, Very Good, Premium, Ideal)}
 #'   \item{color}{diamond colour, from D (best) to J (worst)}