Feature Request: Resolve man:// links

[lingling9000]

It is possible to use Neovim as reader for man pages. While this is a neat feature when developing, this is also useful when maintaining a knowledge base, as the man pages also provide detailed knowledge of all kinds of topics. When maintaining a knowledge base it is good practice to reference to the sources. It would be nice to follow a link to a man page as any other markdown link.

Man page buffers are identified by a leading man:// and therefore easy to identify. A markdown URL leading to a man page would look like that:

• [printf library](man://printf(3))

The man:// can be scrubbed and the leftover printf(3) directly given to the :Man command as parameter.

I'll file a PR with a POC.