In email.parser in message_from_bytes, update `strict` to `policy` (GH-9854) (#9917)

According to the versionchanged note, the `strict` argument was removed in 3.3 and `policy` was added, but the name of the argument in the paragraph wasn't updated.
(cherry picked from commit a5ca98537b9f3f5eeae9157b1548b741df3fbf90)

Co-authored-by: Cheryl Sabella <cheryl.sabella@gmail.com>
diff --git a/Doc/library/email.parser.rst b/Doc/library/email.parser.rst
index e0cab6a..49b4e99 100644
--- a/Doc/library/email.parser.rst
+++ b/Doc/library/email.parser.rst
@@ -238,7 +238,7 @@
 
    Return a message object structure from a :term:`bytes-like object`.  This is
    equivalent to ``BytesParser().parsebytes(s)``.  Optional *_class* and
-   *strict* are interpreted as with the :class:`~email.parser.BytesParser` class
+   *policy* are interpreted as with the :class:`~email.parser.BytesParser` class
    constructor.
 
    .. versionadded:: 3.2