doc: add compatibility anchor for ImageSlide section

Support old links from before 1f58432 changed the section title. Signed-off-by: Benjamin Gilbert <[email protected]>
openslide · Jul 22, 2023 · c0315a5 · c0315a5
1 parent ff48873
commit c0315a5
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/doc/index.rst b/doc/index.rst
@@ -346,6 +346,8 @@ Exceptions
    Subclass of :exc:`OpenSlideError`.
 
 
+.. _wrapping-a-pil-image:
+
 Wrapping a Pillow Image
 =======================