Add example of wild card matching in complex subjects

[FragLegs]

In section 7.1.3 we explain how Complex Subjects match when field types are undefined. We need to add an example or two because this text is fairly dense. We should also link to it from the definition of Complex Subjects in section 3.3.

[FragLegs]

Non-normative change. Should be included in v1

[jischr]

working on this. can you add a link in the description to the text you are referring to?

[jischr]

@FragLegs can you add some examples here? I will make a PR

[derrumbe]

I think this is actually section 8.1.3:

https://openid.github.io/sharedsignals/openid-sharedsignals-framework-1_0.html#name-subjects

As long as one element matched, the unspecified on each side turn into wild cards?