Document the formats supported by `Image.load()`

This partially addresses #32166.

(cherry picked from commit a26649de42be62068bd5b46f4aa9bdc711be5e38)

doc/classes/Image.xml

@@ -330,7 +330,7 @@
 			<argument index="0" name="path" type="String">
 			</argument>
 			<description>
-				Loads an image from file [code]path[/code].
+				Loads an image from file [code]path[/code]. See [url=https://docs.godotengine.org/en/latest/getting_started/workflow/assets/importing_images.html#supported-image-formats]Supported image formats[/url] for a list of supported image formats and limitations.
 			</description>
 		</method>
 		<method name="load_jpg_from_buffer">