refactoring: Employ Black code formatting

docs/en/conf.py

@@ -14,7 +14,8 @@ try:
 except ImportError:
     import os
     import sys
-    sys.path.insert(0, os.path.abspath('../'))
+
+    sys.path.insert(0, os.path.abspath("../"))
     from conf_common import *  # noqa: F403,F401
 
 # General information about the project.
@@ -25,4 +26,4 @@ copyright = "2016 - {}, Espressif Systems (Shanghai) Co., Ltd".format(
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
-language = 'en'
+language = "en"