[docs] [issue12531] documentation index entries for * and **

[Terry J. Reedy]

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

> expression must evaluate to a sequence.

To be clear, Eli quoted the doc correctly and Eric correctly suggested that 'sequence' needs to be updated to 'iterable' (in at least two places). Since the patch for this issue will be adding something just above, it could just as well make this change also.

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