Update faq.md

Author: smile37773

articles/spring-apps/enterprise/faq.md

@@ -143,9 +143,9 @@ You can delete the Azure Spring Apps diagnostic settings by using Azure CLI:
 
 ### Which versions of Java runtime are supported in Azure Spring Apps?
 
-Azure Spring Apps supports Java LTS versions with the most recent builds, currently Java 8, Java 11, and Java 17 are supported. 
+Azure Spring Apps supports Java LTS versions with the most recent builds, currently Java 8, Java 11, Java 17, and Java 21 are supported. 
 
-### How long are Java 8, Java 11, and Java 17 LTS versions supported?
+### How long are Java 8, Java 11, Java 17, and Java 21 LTS versions supported?
 
 See [Java long-term support for Azure and Azure Stack](/azure/developer/java/fundamentals/java-support-on-azure).