[docs] [issue27720] decimal.Context.to_eng_string wrong docstring

[Roundup Robot]

Roundup Robot added the comment:

New changeset de2a9c98948e by Raymond Hettinger in branch '3.5':
Issue #27720: Fix error in eng_to_decimal docs and add examples from the specification.
https://hg.python.org/cpython/rev/de2a9c98948e

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<http://bugs.python.org/issue27720>
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