[docs] [issue13753] str.join description contains an incorrect reference to argument

[Terry J. Reedy]

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

I see the two as really one issue -- minor corrections to the string section of stdtype.rst -- that py.user happened to have filed as two.
But I could have left out the closes and done at least one explicitly.
Or I could have closed this and said I was consolidating with #13754.
Thanks for pointing out the typo.

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