Warn about Quartz dropping tables on restart

Closes gh-15295

Author: Grannath

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -5999,9 +5999,10 @@ following example:
 	spring.quartz.jdbc.initialize-schema=always
 ----
 
-NOTE: By default, the database is detected and initialized by using the standard scripts
-provided with the Quartz library. It is also possible to provide a custom script by
-setting the `spring.quartz.jdbc.schema` property.
+WARNING: By default, the database is detected and initialized by using the standard scripts
+provided with the Quartz library. These scripts drop existing tables, deleting all triggers
+on every restart. It is also possible to provide a custom script by setting the
+`spring.quartz.jdbc.schema` property.
 
 To have Quartz use a `DataSource` other than the application's main `DataSource`, declare
 a `DataSource` bean, annotating its `@Bean` method with `@QuartzDataSource`. Doing so