[docs] [issue13790] In str.format an incorrect error message for list, tuple, dict, set

[Terry J. Reedy]

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

In msg151730, R. David Murry said "Terry's [first] patch with the ("{}") removed should be committed, though."
In msg151738, Eric V. Smith said "I agree with your comment about Terry's patch."

My second patch removed "{}" but also made more text changes, explained in msg151757.  Someone should re-review

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<https://bugs.python.org/issue13790>
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