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

[Serhiy Storchaka]

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

PR 10330 adds few references for using an ellipsis as a placeholder.

----------
nosy: +serhiy.storchaka

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue9842>
_______________________________________