Remove superfluous comments

Use '^\s+//\ \~\ .*$' and '^\s+//\ ============+$' regular expression
searches to remove superfluous comments.

Prior to this commit, many classes would have comments to indicate
blocks of code (such as constructors/methods/instance fields). These
added a lot of noise and weren't all that helpful, especially given
the outline views available in most modern IDEs.

Issue gh-8945

remoting/src/test/java/org/springframework/security/remoting/httpinvoker/AuthenticationSimpleHttpInvokerRequestExecutorTests.java

@@ -39,8 +39,6 @@ import org.springframework.security.core.context.SecurityContextHolder;
  */
 public class AuthenticationSimpleHttpInvokerRequestExecutorTests {
 
-	// ~ Methods
-	// ========================================================================================================
 	@After
 	public void tearDown() {
 		SecurityContextHolder.clearContext();
@@ -95,9 +93,6 @@ public class AuthenticationSimpleHttpInvokerRequestExecutorTests {
 		assertThat(conn.getRequestProperty("Authorization")).isNull();
 	}
 
-	// ~ Inner Classes
-	// ==================================================================================================
-
 	private class MockHttpURLConnection extends HttpURLConnection {
 
 		private Map<String, String> requestProperties = new HashMap<>();

remoting/src/test/java/org/springframework/security/remoting/rmi/ContextPropagatingRemoteInvocationTests.java

@@ -39,8 +39,6 @@ import org.springframework.test.util.ReflectionTestUtils;
  */
 public class ContextPropagatingRemoteInvocationTests {
 
-	// ~ Methods
-	// ========================================================================================================
 	@After
 	public void tearDown() {
 		SecurityContextHolder.clearContext();