[docs] [issue9842] Document ... used in recursive repr of containers

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:


New changeset 6c48bf2d9e1e18dfbfa35f7582ddd32f11f75129 by Serhiy Storchaka in branch 'master':
bpo-9842: Add references for using "..." as a placeholder to the index. (GH-10330)
https://github.com/python/cpython/commit/6c48bf2d9e1e18dfbfa35f7582ddd32f11f75129


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