docs: Explain a bit more explicitly how to configure Apple auth.
docs: Explain a bit more explicitly how to configure Apple auth.

In particular the Services ID and Bundle ID each have one of Apple's
random-looking 10-character identifiers, in addition to the Java-style
names the admin chooses.  Best to be clear about what names are
supposed to be the chosen names and which are supposed to be the
random-looking assigned names.

(I don't know of any docs elsewhere making this clear -- but I guessed
it'd be this way, and empirically it works.)

Also mention you need to enable the backend. :-)

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