[CodeStyle][F601] Update .flake8 config (#46720)

* Update README.md

* Update README.md

* Update .flake8 config: remove F601 code, text=document_fix

.flake8

@@ -18,7 +18,7 @@ ignore =
     # F, see https://flake8.pycqa.org/en/latest/user/error-codes.html
     F403,F405,
     F522,F524,F541,
-    F601,F631,F632,
+    F631,F632,
     F811,F821,F841,
 
     # W, see https://pycodestyle.pycqa.org/en/latest/intro.html#error-codes