Could you please check the attached patch of info.el?

I'm a bit concerned about the "symbol link" face: I think it's helpful
that they're distinct from the info link face.  On the other hand the
colour is then inconsistent to links as they appear in the help buffers.

The other concern is that the info documentation from freshly installed
packages (in the current Emacs session) are still excluded from the
linking process..

I'm looking forward to your assessments