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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3e723559d9f1 by R David Murray in branch '3.4':
#25679: spelling fix
https://hg.python.org/cpython/rev/3e723559d9f1

New changeset 44ca5e073feb by R David Murray in branch '3.5':
Merge: #25679: spelling fix
https://hg.python.org/cpython/rev/44ca5e073feb

New changeset 14a3cfc477c6 by R David Murray in branch 'default':
Merge: #25679: spelling fix
https://hg.python.org/cpython/rev/14a3cfc477c6

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nosy: +python-dev

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