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After reviewing Sanyam's PR at https://github.com/python/cpython/pull/172 I ended up rejecting it as an approach to resolving this issue.
The core problem with the approach is that accessing `_sitebuiltins._Helper` is an implementation detail twice over:
- Python implementations aren't required to have a _sitebuiltins module
- that module isn't required to contain a _Helper class
That means importing it into a general purpose module like pydoc would couple pydoc specifically to the way CPython works, which is something we try to avoid doing.
By contrast, a richer `__help__()` protocol to override the `__doc__` based default behaviour would allow any object to implement it, and _sitebuiltins._Helper could just use that protocol to special case itself.