Sample code points to a `schema.gql` file that does not exist.

[sam-goodwin]

Sample code points to a schema.gql file that does not exist.

new appsync.GraphqlApi(stack, 'api', {
  name: 'api',
  schema: appsync.Schema.fromAsset(path.join(__dirname, 'schema.gql')),
  authorizationConfig: {
    defaultAuthorization: {
      authorizationType: appsync.AuthorizationType.LAMBDA,
      lambdaAuthorizerConfig: {
        handler: authFunction.resource,
      },
    },
  },
});