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

crypto/src/test/java/org/springframework/security/crypto/password/LdapShaPasswordEncoderTests.java

@@ -29,14 +29,8 @@ import static org.assertj.core.api.Assertions.assertThat;
 @SuppressWarnings("deprecation")
 public class LdapShaPasswordEncoderTests {
 
-	// ~ Instance fields
-	// ================================================================================================
-
 	LdapShaPasswordEncoder sha = new LdapShaPasswordEncoder();
 
-	// ~ Methods
-	// ========================================================================================================
-
 	@Test
 	public void invalidPasswordFails() {
 		assertThat(this.sha.matches("wrongpassword", "{SHA}ddSFGmjXYPbZC+NXR2kCzBRjqiE=")).isFalse();

crypto/src/test/java/org/springframework/security/crypto/password/MessageDigestPasswordEncoderTests.java

@@ -33,9 +33,6 @@ import static org.assertj.core.api.Assertions.assertThat;
 @SuppressWarnings("deprecation")
 public class MessageDigestPasswordEncoderTests {
 
-	// ~ Methods
-	// ========================================================================================================
-
 	@Test
 	public void md5BasicFunctionality() {
 		MessageDigestPasswordEncoder pe = new MessageDigestPasswordEncoder("MD5");