Have "source" section

[yoshuawuyts]

Found myself debugging a tool today, and turned out I had 2 tools installed with duplicate names.

The way I found out was thanks to the "source" section in the man page, providing a key differentiator between the tools.

I propose we add a "source" section to the man page, which ideally can be populated by consumers using the repository value from the Cargo.toml in upstream consumers of man.

Thanks!

Screenshot