[docs] [issue29981] Update Index for set, dict, and generator 'comprehensions'

[Terry J. Reedy]

Terry J. Reedy added the comment:

See #29983 for expanding the title of the 'atoms' section containing subsections on comprehensions.

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title: Update Index set, dict, and generator 'comprehensions' -> Update Index for set, dict, and generator 'comprehensions'

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29981>
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