Add a link to the web documentation in the command description

[mcarmonaa]

Related to the empathy session.

Command descriptions are really short, what is fine, but maybe a link to the web documentation in the main command description would be helpful.

[dpordomingo]

I also think that linking web docs from command logs would be great... but then we could have broken links in the binary (what would be a bad idea) If we do so, we should do integration tests to ensure that links in the command messages are up to date. For a mature project, with stable docs and such, it's a great idea... but I think it won't for this evolving prod.

In the meanwhile, I'd vote for enhancing command descriptions.