Add internal link to image widget

Author: pbugnion

docs/source/examples/Widget List.ipynb

@@ -1092,7 +1092,7 @@
     "pd.read_csv(io.StringIO(codecs.decode(uploaded_file[\"content\"], encoding=\"utf-8\")))\n",
     "```\n",
     "\n",
-    "If the uploaded file is an image, you can visualize it with an image widget:\n",
+    "If the uploaded file is an image, you can visualize it with an [image](#Image) widget:\n",
     "\n",
     "```python\n",
     "widgets.Image(value=uploaded_file[\"content\"].tobytes())\n",