Document @DirtiesContext semantics when declared at class & method level

Closes gh-30623

Author: sbrannen

framework-docs/modules/ROOT/pages/testing/annotations/integration-spring/annotation-dirtiescontext.adoc

@@ -12,7 +12,11 @@ metadata.
 You can use `@DirtiesContext` as both a class-level and a method-level annotation within
 the same class or class hierarchy. In such scenarios, the `ApplicationContext` is marked
 as dirty before or after any such annotated method as well as before or after the current
-test class, depending on the configured `methodMode` and `classMode`.
+test class, depending on the configured `methodMode` and `classMode`. When
+`@DirtiesContext` is declared at both the class level and the method level, the
+configured modes from both annotations will be honored. For example, if the class mode is
+set to `BEFORE_EACH_TEST_METHOD` and the method mode is set to `AFTER_METHOD`, the
+context will be marked as dirty both before and after the given test method.
 
 The following examples explain when the context would be dirtied for various
 configuration scenarios:

spring-test/src/main/java/org/springframework/test/annotation/DirtiesContext.java

@@ -39,6 +39,12 @@
  * {@code ApplicationContext} will be marked as <em>dirty</em> before or
  * after any such annotated method as well as before or after the current test
  * class, depending on the configured {@link #methodMode} and {@link #classMode}.
+ * When {@code @DirtiesContext} is declared at both the class level and the
+ * method level, the configured test phases from both annotations will be honored.
+ * For example, if the class mode is set to {@link ClassMode#BEFORE_EACH_TEST_METHOD
+ * BEFORE_EACH_TEST_METHOD} and the method mode is set to
+ * {@link MethodMode#AFTER_METHOD AFTER_METHOD}, the context will be marked as
+ * dirty both before and after the given test method.
  *
  * <h3>Supported Test Phases</h3>
  * <ul>