Include stat_binhex aesthetics in documentation for geom_hex and stat_binhex (#6062)

Author: jansim

R/geom-hex.R

@@ -6,6 +6,7 @@
 #' the very regular alignment of [geom_bin_2d()].
 #'
 #' @eval rd_aesthetics("geom", "hex")
+#' @eval rd_aesthetics("stat", "binhex")
 #' @seealso [stat_bin_2d()] for rectangular binning
 #' @param geom,stat Override the default connection between `geom_hex()` and
 #'   `stat_bin_hex()`. For more information about overriding these connections,