docs: s/ai.getAuthContext()/getFlowAuth(...

Was looking at Auth policies, can someone confirm this is the right change to make in the docs? https://github.com/firebase/genkit/pull/1584
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From what I can tell ai.getAuthContext(); does not exist and we should likely be using getFlowAuth() from the Genkit package instead.
Checklist (if applicable):

PR title is following https://www....
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