don't link interp/akima packages

Author: teunbrand

R/geom-contour.R

@@ -9,7 +9,7 @@
 #' once. Missing values of `z` are allowed, but contouring will only work for
 #' grid points where all four corners are non-missing. If you have irregular
 #' data, you'll need to first interpolate on to a grid before visualising,
-#' using [interp::interp()], [akima::bilinear()], or similar.
+#' using `interp::interp()`, `akima::bilinear()`, or similar.
 #'
 #' @eval rd_aesthetics("geom", "contour")
 #' @eval rd_aesthetics("geom", "contour_filled")