[docs] [issue29352] provide the authorative source for s[i:j] negative slice indices (<-len(s)) behavior for standard sequences

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29352>
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