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

samples/xml/jaas/src/main/java/samples/jaas/UsernameEqualsPasswordLoginModule.java

@@ -34,15 +34,12 @@ import javax.security.auth.spi.LoginModule;
  * @author Rob Winch
  */
 public class UsernameEqualsPasswordLoginModule implements LoginModule {
-	// ~ Instance fields
-	// ================================================================================================
+
 
 	private String password;
 	private String username;
 	private Subject subject;
 
-	// ~ Methods
-	// ========================================================================================================
 
 	@Override
 	public boolean abort() {