[docs] [issue19698] Implement _imp.exec_builtin and exec_dynamic

[Brett Cannon]

Brett Cannon added the comment:

At this point both FrozenImporter and BuiltinImporter support exec_module(), so the only thing left to do is to document when FrozenImporter and WindowsRegistryFinder gained their exec_module() implementations (BuiltinImporter already has a note about it).

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assignee:  -> docs at python
keywords: +easy
nosy: +docs at python
priority: critical -> low
stage: test needed -> needs patch
versions: +Python 3.6

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