Fix docs generation

[natecraddock]

The recent autodocs changes broke the documentation building step

[natecraddock]

Good enough for now as of 1938997

[natecraddock]

Just had another idea.

Currently the tests use the zig module for importing ziglua. If we instead pull in lib.zig, that may give better doc generation. Maybe not, but at least worth looking into

[natecraddock]

Additionally, if we can't get the docs gen to exclude functions depending on the Lua target, then we might as well just generate one doc