[docs] [issue31504] Documentation for return value for string.rindex is missing when search string is empty

[Ashok Bakthavathsalam]

Changes by Ashok Bakthavathsalam <lifebalance at gmail.com>:


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assignee:  -> docs at python
components: +Documentation -Library (Lib)
nosy: +docs at python

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31504>
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