[issue3152] ast module docs document private attribute

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

I disagree. The AST classes are auto-generated, the leading underscore
of _fields is there to avoid clashes with field names from the AST types.

This is similar to
http://docs.python.org/dev/library/collections#collections.somenamedtuple._fields
which shouldn't be renamed, but isn't private either.

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