Expand acronyms FQN and FQCN

Closes gh-33452

spring-tx/src/test/java/org/springframework/transaction/interceptor/RuleBasedTransactionAttributeTests.java

@@ -108,7 +108,7 @@ class RuleBasedTransactionAttributeTests {
 	void ruleForCommitOnSubclassOfChecked() {
 		List<RollbackRuleAttribute> list = new ArrayList<>();
 		// Note that it's important to ensure that we have this as
-		// a FQN: otherwise it will match everything!
+		// fully-qualified class name: otherwise it will match everything!
 		list.add(new RollbackRuleAttribute("java.lang.Exception"));
 		list.add(new NoRollbackRuleAttribute("IOException"));
 		RuleBasedTransactionAttribute rta = new RuleBasedTransactionAttribute(TransactionDefinition.PROPAGATION_REQUIRED, list);

spring-tx/src/test/java/org/springframework/transaction/interceptor/TransactionAttributeSourceEditorTests.java

@@ -28,7 +28,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
 /**
  * Tests for {@link TransactionAttributeSourceEditor}.
  *
- * <p>Format is: {@code FQN.Method=tx attribute representation}
+ * <p>Format is: {@code <fully-qualified class name>.<method-name>=tx attribute representation}
  *
  * @author Rod Johnson
  * @author Sam Brannen