pythongh-118455: Fix mangle_from_ default value in email.policy.Polic…

…y.__doc__ (python#118456)

* Fix mangle_from_ default value in email.policy.Policy.__doc__

The docstring says it defaults to True, but it actually defaults
to False. Only the Compat32 subclass overrides that.

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Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Lib/email/_policybase.py

@@ -152,7 +152,7 @@ class Policy(_PolicyBase, metaclass=abc.ABCMeta):
     mangle_from_        -- a flag that, when True escapes From_ lines in the
                            body of the message by putting a `>' in front of
                            them. This is used when the message is being
-                           serialized by a generator. Default: True.
+                           serialized by a generator. Default: False.
 
     message_factory     -- the class to use to create new message objects.
                            If the value is None, the default is Message.