Handle multi-line post-field Doxygen comments

[varungandhi-src]

At the moment, we're just considering the first line.

https://sourcegraph.com/github.com/NVIDIA/MDL-SDK@190249748ddfe75b133b9da9028cc6272928c1b5/-/blob/include/mi/neuraylib/target_code_types.h?L1164-1165

It seems like this should ideally be fixed upstream, because clangd also has the same issue.