[docs] [issue23006] Improve the doc and indexing of adict.__missing__.

Roundup Robot added the comment:

New changeset 0fe3fb886c38 by Terry Jan Reedy in branch '2.7': Issue #23006: Improve the documentation and indexing of dict.__missing__. https://hg.python.org/cpython/rev/0fe3fb886c38

New changeset 31875b244bdf by Terry Jan Reedy in branch '3.4': Issue #23006: Improve the documentation and indexing of dict.__missing__. https://hg.python.org/cpython/rev/31875b244bdf

New changeset 41b172fd4479 by Terry Jan Reedy in branch '3.4': Issue #23006 whitespace https://hg.python.org/cpython/rev/41b172fd4479

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