[issue36168] DOC: Fix capitalization in string.rst

[Sanyam Khurana]

Sanyam Khurana <sanyam.khurana01 at gmail.com> added the comment:

Mariatta, I see it also needs a backport to 3.8

We can close it once the backport is completed.

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nosy: +CuriousLearner

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<https://bugs.python.org/issue36168>
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