[Catalyst] Some bits missing/wrong in the docs for the dev version of C::P::Authentication

[Dave Rolsky]

I was trying to figure out why the authen/session integration bits weren't 
working and I realized there's a couple problems in the docs here.

First, AFAICT, there's no mention that beyond setting "use_session" to 
true in your config, you have to indicate that your user class supports 
sessions.

Second, the method documentation in C::P::A::Internals suggests that you 
should provide a method named "supports_features" in your user class. 
However, looking at the code, it seems like this method is expected to be 
named "support".

Finally, those same internals docs mention a Store class method 
"user_supports", which AFAICT is kind of redundant, and not really used 
anyway.


-dave

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