Pull latest Sphinx theme (pytorch#158595) (pytorch#158673)

Pull Request resolved: pytorch#158595
Approved by: https://github.com/albanD

(cherry picked from commit 79e49ef)

Author: svekars

.ci/docker/requirements-docs.txt

@@ -4,7 +4,7 @@ sphinx==5.3.0
 -e git+https://github.com/pytorch/pytorch_sphinx_theme.git@pytorch_sphinx_theme2#egg=pytorch_sphinx_theme2
 
 # TODO: sphinxcontrib.katex 0.9.0 adds a local KaTeX server to speed up pre-rendering
-# but it doesn't seem to work and hangs around idly. The initial thought is probably
+# but it doesn't seem to work and hangs around idly. The initial thought it is probably
 # something related to Docker setup. We can investigate this later
 
 sphinxcontrib.katex==0.8.6

docs/source/conf.py

@@ -82,6 +82,10 @@
 ]
 sitemap_url_scheme = "{link}"
 
+html_additional_pages = {
+    "404": "404.html",
+}
+
 # build the templated autosummary files
 autosummary_generate = True
 numpydoc_show_class_members = False