Fix checkstyle errors

Author: philwebb

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilterTests.java

@@ -32,7 +32,7 @@
 
 /**
  * Tests for {@link MetricsWebFilter}
- * 
+ *
  * @author Brian Clozel
  */
 public class MetricsWebFilterTests {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/PropertyMapper.java

@@ -167,7 +167,7 @@ public interface SourceOperator {
 
 	/**
 	 * A source that is in the process of being mapped.
-	 * 
+	 *
 	 * @param <T> the source type
 	 */
 	public static final class Source<T> {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/AggregateBinder.java

@@ -91,7 +91,7 @@ protected final Context getContext() {
 
 	/**
 	 * Internal class used to supply the aggregate and cache the value.
-	 * 
+	 *
 	 * @param <T> The aggregate type
 	 */
 	protected static class AggregateSupplier<T> {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/util/LambdaSafe.java

@@ -367,7 +367,7 @@ public boolean match(Class<C> callbackType, C callbackInstance, A argument,
 	 * The result of a callback which may be a value, {@code null} or absent entirely if
 	 * the callback wasn't suitable. Similar in design to {@link Optional} but allows for
 	 * {@code null} as a valid value.
-	 * 
+	 *
 	 * @param <R> The result type
 	 */
 	public static final class InvocationResult<R> {