adding mention to get_pixels

Author: villares

py5_docs/Reference/api_en/Py5Graphics_copy.txt

@@ -28,3 +28,5 @@ Copies a region of pixels from the `Py5Graphics` object to another area of the c
 This function ignores [](py5graphics_image_mode).
 
 This method is the same as [](sketch_copy) but linked to a `Py5Graphics` object. To see example code for how it can be used, see [](sketch_copy).
+
+If you want to create a new image with the contents of a rectangular region of a `Py5Graphics` object, check out the [](py5graphics_get_pixels) method, where x, y, w, h, are the position and dimensions of the area to be copied. It will return a `Py5Image object`.