message: Add useSession import to clarify Auth docs
diff: @@ -288,6 +288,8 @@ The `useSession` hook can be called in any part of your API.
  Here's an example of a GraphQL query that gets the current user from the session.
  ```js title="services/functions/graphql/types/foo.ts"
  +import { useSession } from "@serverless-stack/node/auth";
  +
  builder.mutationFields((t) => ({
  createTask: t.field({
  type: TaskType,
  