Adopt common autodoc_typehints configuration

See ansys/pydpf-post#169

Author: greschd

doc/source/conf.py

@@ -59,6 +59,10 @@
     # "pyvista": ("https://docs.pyvista.org/", None),
 }
 
+# sphinx_autodoc_typehints configuration
+typehints_defaults = "comma"
+simplify_optional_unions = False
+
 # numpydoc configuration
 numpydoc_show_class_members = False
 numpydoc_xref_param_type = True