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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

5 is not valid index of character, but it is valid index of substring.

IMHO documenting explicitly miscellaneous particular cases which are not exceptions of general rules just adds a noise. This makes the documentation larger and decrease the chance that it will be read.

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nosy: +r.david.murray, rhettinger

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<https://bugs.python.org/issue31504>
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