Autodocument llvmlite

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Feature request

Currently llvmlite isn't making use of the Sphinx autodoc feature, but instead the docs have been written verbatim into the git repository, for example:

https://github.com/numba/llvmlite/blob/main/docs/source/user-guide/ir/ir-builder.rst

The feature request is to check and replace all documentation with an autogenerated version that derives the documentation from the docstrings in the source code.