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[3.13] gh-122701: Fix wording of raw strings/bytes in `lexical_analysis.rst` (GH-122702) (#122914) 

gh-122701: Fix wording of raw strings/bytes in `lexical_analysis.rst` (GH-122702)
(cherry picked from commit ea70439bd2)

Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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Doc/reference/lexical_analysis.rst
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@ -503,11 +503,10 @@ must be expressed with escapes.
single: r"; raw string literal
Both string and bytes literals may optionally be prefixed with a letter ``'r'``
or ``'R'``; such strings are called :dfn:`raw strings` and treat backslashes as
literal characters. As a result, in string literals, ``'\U'`` and ``'\u'``
escapes in raw strings are not treated specially. Given that Python 2.x's raw
unicode literals behave differently than Python 3.x's the ``'ur'`` syntax
is not supported.
or ``'R'``; such constructs are called :dfn:`raw string literals`
and :dfn:`raw bytes literals` respectively and treat backslashes as
literal characters. As a result, in raw string literals, ``'\U'`` and ``'\u'``
escapes are not treated specially.
.. versionadded:: 3.3
The ``'rb'`` prefix of raw bytes literals has been added as a synonym