Consistent abstract declaration for utility classes (plus polishing)

Issue: SPR-16968

spring-core/src/main/java/org/springframework/core/SpringVersion.java

@@ -25,7 +25,7 @@ import org.springframework.lang.Nullable;
  * <p>Note that some ClassLoaders do not expose the package metadata,
  * hence this class might not be able to determine the Spring version
  * in all environments. Consider using a reflection-based check instead:
- * For example, checking for the presence of a specific Spring 2.0
+ * For example, checking for the presence of a specific Spring 5.0
  * method that you intend to call.
  *
  * @author Juergen Hoeller
@@ -33,7 +33,6 @@ import org.springframework.lang.Nullable;
  */
 public final class SpringVersion {
 
-
 	private SpringVersion() {
 	}
 

spring-core/src/main/java/org/springframework/core/env/ProfilesParser.java

@@ -32,7 +32,11 @@ import org.springframework.util.StringUtils;
  * @author Phillip Webb
  * @since 5.1
  */
-abstract class ProfilesParser {
+final class ProfilesParser {
+
+	private ProfilesParser() {
+	}
+
 
 	static Profiles parse(String... expressions) {
 		Assert.notEmpty(expressions, "Must specify at least one profile");