Polish warning about virtual threads and the JVM exiting

Closes gh-39732

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

@@ -387,11 +387,10 @@ If you're running on Java 21 or up, you can enable virtual threads by setting th
 Before turning on this option for your application, you should consider https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html[reading the official Java virtual threads documentation].
 In some cases, applications can experience lower throughput because of "Pinned Virtual Threads"; this page also explains how to detect such cases with JDK Flight Recorder or the `jcmd` CLI.
 
-WARNING: One side effect of virtual threads is that these threads are daemon threads.
-A JVM will exit if there are no non-daemon threads.
-This behavior can be a problem when you rely on, e.g. `@Scheduled` beans to keep your application alive.
+WARNING: One side effect of virtual threads is that they are daemon threads.
+A JVM will exit if all of its threads are daemon threads.
+This behavior can be a problem when you rely on `@Scheduled` beans, for example, to keep your application alive.
 If you use virtual threads, the scheduler thread is a virtual thread and therefore a daemon thread and won't keep the JVM alive.
-This does not only affect scheduling, but can be the case with other technologies, too!
+This not only affects scheduling and can be the case with other technologies too.
 To keep the JVM running in all cases, it is recommended to set the property configprop:spring.main.keep-alive[] to `true`.
 This ensures that the JVM is kept alive, even if all threads are virtual threads.
-