Docs: Adjust documentation for the `$size` parameter in `image_constrain_size_for_editor()` to clarify the required order of width and height values when passing an array.

See #34257.


git-svn-id: https://develop.svn.wordpress.org/trunk@35033 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/media.php

@@ -31,8 +31,9 @@
  *
  * @param int          $width   Width of the image in pixels.
  * @param int          $height  Height of the image in pixels.
- * @param string|array $size    Optional. Size or array of sizes of what the result image
- *                              should be. Accepts any valid image size name. Default 'medium'.
+ * @param string|array $size    Optional. Image size. Accepts any valid image size, or an array
+ *                              of width and height values in pixels (in that order).
+ *                              Default 'medium'.
  * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'
  *                              (like inserting into an editor). Default null.
  * @return array Width and height of what the result image should resize to.