[issue11479] Add discussion of trailing backslash in raw string to tutorial

[Hanan Basheer]

Change by Hanan Basheer <20b030018 at iitb.ac.in>:


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nosy: +dancinglightning
nosy_count: 10.0 -> 11.0
pull_requests: +26396
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/27949

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue11479>
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