[Libguestfs] [PATCH libnbd 0/4] Miscellaneous Rust cleanups

[Richard W.M. Jones]

Add an overview libnbd-rust(3) man page pointing to the real
documentation.  This is like OCaml & Golang.

When reviewing the real rustdocs I noticed they basically converted
the man pages into plain text, resulting in lots of problems such as
internal links not working, no `code` annotations, etc.  So I wrote a
simple POD to rustdoc translator.  It is by no means perfect, but it
fixes many of the issues.

Also build the examples, to make sure we don't get any regressions.

Rich.