[docs] [issue33847] doc: Add '@' operator entry to index

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

This is definitely an oversight to be corrected.  Index entries for the other binary arithmetic operators point to the table at
https://docs.python.org/3/library/stdtypes.html#numeric-types-int-float-complex
But @ is not in that table since number @ number is meaningless and invalid.  So I agree that the best location is the sentence in
https://docs.python.org/3/reference/expressions.html#binary-arithmetic-operations.

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assignee: docs at python -> terry.reedy
nosy: +terry.reedy

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