Fix formatting using black

docs/conf.py

@@ -192,7 +192,7 @@
 # -- Options for intersphinx extension ---------------------------------------
 
 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'<name>': ('https://docs.python.org/', None)}
+intersphinx_mapping = {"<name>": ("https://docs.python.org/", None)}
 
 # -- Options for todo extension ----------------------------------------------