docs: Use a different set of sphinx-toolbox tools

regex and augment_defults produced broken rst output in some
circumstances.

autonamedtuple, while not rendering type hints very nicely, produces
less verbose documentation for namedtuples, which is beneficial.

doc/conf.py

@@ -30,8 +30,7 @@
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = [
-    "sphinx_toolbox.more_autodoc.augment_defaults",
-    "sphinx_toolbox.more_autodoc.regex",
+    "sphinx_toolbox.more_autodoc.autonamedtuple",
     'sphinx.ext.autodoc',
     'sphinx.ext.doctest',
     'sphinx.ext.todo',