[Bug libstdc++/101198] libstdc++-v3/doc/html/manual/policy_based_data_structures_test.html is not valid XHTML; fails DTD validation

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101198

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this will fix it:

--- a/libstdc++-v3/doc/xml/manual/test_policy_data_structures.xml
+++ b/libstdc++-v3/doc/xml/manual/test_policy_data_structures.xml
@@ -105,6 +105,7 @@
                <imagedata align="center" format="PNG" scale="100"
                           fileref="../images/pbds_hash_text_find.png"/>
              </imageobject>
+             <alt>Graph of results for hash text find</alt>
            </mediaobject>
          </informalfigure>


But it's needed for every image in the doc.