I think the documentation for [nimrtl](https://nim-lang.org/docs/nimc.html#dll-generation) is not clear enough. The first time I saw it, I thought it's something Windows-only, as it only mentions DLL. It took me a few time to figure out that DLL means shared library, and that `nimrtl.dll` is called `libnimrtl.so` on Linux-based systems, so I think the documentation needs to be updated.
