[doc] Update duplicated messages for pycodestyle (#9384)

Added a missing message that duplicates behavior in `pycodestyle` to the FAQ.

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

Author: baco

doc/faq.rst

@@ -70,7 +70,7 @@ You can see the plugin you need to explicitly :ref:`load in the technical refere
 Which messages should I disable to avoid duplicates if I use other popular linters ?
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-pycodestyle_: bad-indentation, bare-except, line-too-long, missing-final-newline, multiple-statements, singleton-comparison, trailing-whitespace, unnecessary-semicolon, unneeded-not, wrong-import-position
+pycodestyle_: bad-indentation, bare-except, line-too-long, missing-final-newline, multiple-statements, singleton-comparison, trailing-newlines, trailing-whitespace, unnecessary-negation, unnecessary-semicolon, wrong-import-position
 
 pyflakes_: undefined-variable, unused-import, unused-variable