[issue37521] importlib examples have their exec_module()/sys.modules assignment lines reversed

[Benjamin Mintz]

Benjamin Mintz <benjabean1 at gmail.com> added the comment:

```
name = 'testext'

spec = importlib.util.find_spec(name)
print(name in sys.modules)
module = importlib.util.module_from_spec(spec)
print(name in sys.modules)
spec.loader.exec_module(module)
print(name in sys.modules)
```

This prints False, False, True though.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37521>
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