docs: fix simple typo, shat -> that
There is a small typo in docs/conf.py.
Should read `that` rather than `shat`.
@@ -327,7 +327,7 @@ epub_copyright = '2013-2022, Audrey Roy and Cookiecutter community'
# The format is a list of tuples containing the path and title.
# epub_pre_files = []
-# HTML files shat should be inserted after the pages created by sphinx.
+# HTML files that should be inserted after the pages created by sphinx.
# The format is a list of tuples containing the path and title.
# epub_post_files = []
