message: Doc: add AppSyncApi lambda authorizer example
diff: @@ -587,6 +587,33 @@ new AppSyncApi(stack, "GraphqlApi", {
  });
  ```
  +#### Using Lambda
  +
  +```js {12-19}
  +import * as appsync from "@aws-cdk/aws-appsync-alpha";
  +import { Function, AppSyncApi } from "@serverless-stack/resources";
  +
  +const authorizer = new Function(this, "AuthorizerFn", {
  + handler: "src/authorizer.main",
  +});
  +
  +new AppSyncApi(stack, "GraphqlApi", {
  + schema: "graphql/schema.graphql",
  + cdk: {
  + graphqlApi: {
  + authorizationConfig: {
  + defaultAuthorization: {
  + authorizationType: appsync.AuthorizationType.LAMBDA,
  + lambdaAuthorizerConfig: {
  + handler: authorizer,
  + },
  + },
  + },
  + },
  + },
  +});
  +```
  +
  #### Using multiple authorization methods
  ```js {8-20}
  