bpo-35864: fix namedtuple._asdict() docstring

[apahim]

Commit 0bb4bdf replaced OrderedDict with regular dict in namedtuple(). This patch just updates the _asdict() docstring.

https://bugs.python.org/issue35864

[the-knights-who-say-ni]

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[eamanu]

LGTM. Please, sign CLA

[miss-islington]

Thanks @apahim for the PR, and @rhettinger for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

[miss-islington]

Sorry, @apahim and @rhettinger, I could not cleanly backport this to 3.7 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 85d83ec7c99727476c79feb5c34c65264a99144e 3.7

[rhettinger]

Thanks for the PR :-)