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

[Ashok Bakthavathsalam]

Ashok Bakthavathsalam added the comment:

How about 

"abcde"[5]
Traceback (most recent call last):
  File "python", line 1, in <module>
IndexError: string index out of range

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