Improve documentation of important ggproto classes (#6426)

* standalone docs for `?Geom`

* redirect Geom class docs to `?Geom`

* standalone docs for `?Stat`

* Redirect Stat class docs to `?Stat`

* standalone docs for `?Position`

* Redirect Position class docs to `?Position`

* polish

* document the Layer class

* standalone docs for `?Guide`

* Redirect `Guide` class docs to `?Guide`

* rename `Coord$transform(range)` to `Coord$transform(panel_params)`

* standalone docs for `?Coord`

* Redirect `Coord` class docs to `?Coord`

* structure scale-.R with section titles

* move helpers to helper section

* standalone docs for `?Scale`

* redirect `Scale` class docs to `?Scale`

* standalone docs for `?Facet`

* redirect `Facet` docs to `?Facet`

* Various polishes

* standalone docs for `?Layout`

* minor polishes

* crosslink docs

* sprinkle some keywords internal around

* fix missing `%||%` on old R versions

* fix missing internal keyword

* stop this self-inflicted buffoonery

* document new method

* incorporate community feedback

Author: teunbrand

R/annotation-custom.R

@@ -58,7 +58,7 @@ annotation_custom <- function(grob, xmin = -Inf, xmax = Inf, ymin = -Inf, ymax =
   )
 }
 
-#' @rdname ggplot2-ggproto
+#' @rdname Geom
 #' @format NULL
 #' @usage NULL
 #' @export

R/annotation-logticks.R

@@ -123,7 +123,7 @@ annotation_logticks <- function(base = 10, sides = "bl", outside = FALSE, scaled
   )
 }
 
-#' @rdname ggplot2-ggproto
+#' @rdname Geom
 #' @format NULL
 #' @usage NULL
 #' @export

R/annotation-map.R

@@ -76,7 +76,7 @@ annotation_map <- function(map, ...) {
   )
 }
 
-#' @rdname ggplot2-ggproto
+#' @rdname Geom
 #' @format NULL
 #' @usage NULL
 #' @export

R/annotation-raster.R

@@ -61,7 +61,7 @@ annotation_raster <- function(raster, xmin, xmax, ymin, ymax,
 
 }
 
-#' @rdname ggplot2-ggproto
+#' @rdname Geom
 #' @format NULL
 #' @usage NULL
 #' @export