Polish "Configure devtools to set trace probability to 100% by default"

See gh-47721

Author: snicoll

documentation/spring-boot-docs/src/docs/antora/modules/reference/pages/using/devtools.adoc

@@ -68,6 +68,9 @@ For this reason, spring-boot-devtools disables the caching options by default.
 
 Cache options are usually configured by settings in your `application.properties` file.
 For example, Thymeleaf offers the configprop:spring.thymeleaf.cache[] property.
+
+The same applies for tracing probability that's set to 100% as the default may not log all traces used for testing.
+
 Rather than needing to set these properties manually, the `spring-boot-devtools` module automatically applies sensible development-time configuration.
 
 The following table lists all the properties that are applied: