[issue30625] Documentation is unclear how "y*" and "y#" formit units vary

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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stage:  -> needs patch
type: enhancement -> behavior
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30625>
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