Refine contribution #4167

The documentation generation change introduced
in #4167 seems to scan more files than previously
WRT checking the code formatting style.

This commit fixes the formatting of the files
that do not conform to the Spring style.

spring-batch-samples/src/test/java/org/springframework/batch/sample/domain/multiline/AggregateItemReaderTests.java

@@ -36,16 +36,16 @@ class AggregateItemReaderTests {
 			@Override
 			public AggregateItem<String> read() {
 				switch (count++) {
-				case 0:
-					return AggregateItem.getHeader();
-				case 1:
-				case 2:
-				case 3:
-					return new AggregateItem<>("line");
-				case 4:
-					return AggregateItem.getFooter();
-				default:
-					return null;
+					case 0:
+						return AggregateItem.getHeader();
+					case 1:
+					case 2:
+					case 3:
+						return new AggregateItem<>("line");
+					case 4:
+						return AggregateItem.getFooter();
+					default:
+						return null;
 				}
 			}