position param updated with extra notes (#6454)

Author: williamlai2

R/guide-legend.R

@@ -22,6 +22,7 @@
 #'   `legend.justification.*`, `legend.location` and `legend.box.*`.
 #' @param position A character string indicating where the legend should be
 #'   placed relative to the plot panels.
+#'   One of "top", "right", "bottom", "left", or "inside".
 #' @param direction  A character string indicating the direction of the guide.
 #'   One of "horizontal" or "vertical".
 #' @param override.aes A list specifying aesthetic parameters of legend key.