Update java-spring-boot.md

Author: jeanbisutti

articles/azure-monitor/app/java-spring-boot.md

@@ -51,6 +51,9 @@ And invoke the `attach()` method of the `com.microsoft.applicationinsights.attac
 > [!TIP]
 > ⚠ JRE is not supported.
 
+> [!TIP]
+> ⚠ Read-only file system is not supported.
+
 > [!TIP]
 > ⚠ The invocation must be requested at the beginning of the `main` method.