[docs] [issue25679] Fix typo in Doc/reference/executionmodel.rst

[R. David Murray]

R. David Murray added the comment:

Fixed, thanks.  I wonder if it was one of our german speakers who typed that :)

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nosy: +r.david.murray
resolution:  -> fixed
stage:  -> resolved
status: open -> closed
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25679>
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