loader, module: Fix help_prefix cleanup & example docs #1303
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Callable cleanup in loader now always uses help_prefix's default value to replace. The documentation for module.example() reflects this, and I also moved the constructor documentation up to where it would be included in the auto-generated API docs (so the parameters are now visible in the public documentation without reading the code).
This should resolve #1283. I might add sanity checking for
help_prefix
(e.g. checking its length and printing a warning on startup if it's longer than one character), based on feedback from @kwaaak.