[docs] [issue12043] Update shutil documentation

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

-   If *symlinks* is true, symbolic links in the source tree are
+   If *symlinks* is ``True``, symbolic links in the source tree are

I’m not sure about that change.  It may be on purpose that lower-case true is used, given that the code will accept anything that evaluates to True in a boolean context, but does not strictly requires a bool instance.

See also #7969 for another shutil doc bug.

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