Update examples/powertools-examples-serialization/sam-graalvm/README.md

Fix documentation url

Co-authored-by: Philipp Page <philipp.page@yahoo.de>

Author: jreijn

examples/powertools-examples-serialization/sam-graalvm/README.md

@@ -1,6 +1,6 @@
 #  Powertools for AWS Lambda (Java) - Serialization Example
 
-This project contains an example of Lambda function using the serialization utilities module of Powertools for AWS Lambda (Java). For more information on this module, please refer to the [documentation](https://docs.powertools.aws.dev/lambda-java/utilities/serialization/).
+This project contains an example of Lambda function using the serialization utilities module of Powertools for AWS Lambda (Java). For more information on this module, please refer to the [documentation](https://docs.powertools.aws.dev/lambda-java/latest/utilities/serialization/).
 
 The project contains two `RequestHandler`s -