fix(readme): typo fix in version name

Author: ge0Aja

aws/logs_monitoring/README.md

@@ -178,7 +178,7 @@ The <a href="#cloudformation-parameters">environment variables provided on this
 
 If you encounter issues upgrading to the latest version, check the Troubleshooting section.
 
-### Upgrade to 5.2.0+
+### Upgrade to v5.2.0+
 
 Starting version 5.2.0+ Lambda function has been updated to require **Python 3.14**. If upgrading an older forwarder installation to 5.2.0+, ensure AWS Lambda function is configured to use Python 3.14