[#16895] Add alt description to new images

wouterj · wouterj · commit c930c0ae77b2 · 2023-09-01T19:47:15.000+02:00
diff --git a/components/var_dumper.rst b/components/var_dumper.rst
@@ -483,6 +483,7 @@ then its dump representation::
     dump($var);
 
 .. image:: /_images/components/var_dumper/10-uninitialized.png
+    :alt: Dump output where the uninitialized property is represented by a question mark followed by the type definition.
 
 .. versionadded:: 6.4
 
