Corrects bins / binwidth override documentation (#4720)

Fixes #4651

Author: eliocamp

NEWS.md

@@ -56,6 +56,10 @@
 
 * `geom_contour()` now accepts a function in the `breaks` argument (@eliocamp, #4652).
 
+* Updated documentation for `geom_contour()` to correctly reflect argument 
+precedence between `bins` and `binwidth`. (@eliocamp, #4651)
+
+
 # ggplot2 3.3.5
 This is a very small release focusing on fixing a couple of untenable issues 
 that surfaced with the 3.3.4 release

R/geom-contour.r

@@ -17,8 +17,8 @@
 #' @inheritParams layer
 #' @inheritParams geom_point
 #' @inheritParams geom_path
-#' @param bins Number of contour bins. Overridden by `binwidth`.
-#' @param binwidth The width of the contour bins. Overridden by `breaks`.
+#' @param binwidth The width of the contour bins. Overridden by `bins`.
+#' @param bins Number of contour bins. Overridden by `breaks`.
 #' @param breaks One of:
 #'   - Numeric vector to set the contour breaks
 #'   - A function that takes the range of the data and binwidth as input