General polish of new 4.0 classes

Apply consistent styling to new classes introduced in Spring 4.0.

- Javadoc line wrapping, whitespace and formatting
- General code whitespace
- Consistent Assert.notNull messages

spring-core/src/test/java/org/springframework/util/SocketUtilsTests.java

@@ -27,7 +27,6 @@ import static org.springframework.util.SocketUtils.*;
  * Unit tests for {@link SocketUtils}.
  *
  * @author Sam Brannen
- * @since 4.0
  */
 public class SocketUtilsTests {