Update CDK hot reloading docs (#217)

Author: silv-io

content/en/integrations/aws-cdk/index.md

@@ -83,6 +83,9 @@ $ awslocal sns list-topics
 }
 {{< /command >}}
 
+## Other resources
+- [Hot-swapping Lambda functions with CDK]({{< ref "tools/lambda-tools/hot-swapping#aws-cloud-development-kit-cdk-configuration" >}})
+
 ## External resources
 
 - [aws-cdk-local](https://github.com/localstack/aws-cdk-local)

content/en/tools/lambda-tools/hot-swapping/index.md

@@ -292,7 +292,11 @@ class ApplicationStack(parent: Construct, name: String) : Stack(parent, name) {
      */
     private fun buildCodeSource(): Code  {
         if (STAGE == "local") {
-            val bucket = Bucket.fromBucketName(this, "HotReloadingBucket", "__local__")
+            /**
+             * For CDK you have to use a valid S3 bucket name instead of '__local__'
+             * because of client-side validation
+             */
+            val bucket = Bucket.fromBucketName(this, "HotReloadingBucket", "hot-code")
             return Code.fromBucket(bucket, LAMBDA_MOUNT_CWD)
         }
 
@@ -301,6 +305,13 @@ class ApplicationStack(parent: Construct, name: String) : Stack(parent, name) {
 }
 {{< / highlight >}}
 
+{{% alert %}}
+
+**Note**: As mentioned in the code, you will have to use an alternative local bucket marker to `__local__` as this is not a valid S3 bucket name.
+To change it (to, e.g., `hot-code`) you can use the environment variable `BUCKET_MARKER_LOCAL`.
+
+{{% /alert %}}
+
 Then to bootstrap and deploy the stack run the following shell script
 
 {{< command >}}