8330178: Clean up non-standard use of /** comments in java.base

Reviewed-by: darcy, iris, dfuchs, aivanov, naoto

src/java.base/share/classes/sun/net/www/content/text/plain.java

@@ -23,15 +23,15 @@
  * questions.
  */
 
-/**
- * Plain text file handler.
- * @author  Steven B. Byrne
- */
 package sun.net.www.content.text;
 import java.net.*;
 import java.io.InputStream;
 import java.io.IOException;
 
+/**
+ * Plain text file handler.
+ * @author  Steven B. Byrne
+ */
 public class plain extends ContentHandler {
     /**
      * Returns a PlainTextInputStream object from which data

src/java.base/share/classes/sun/net/www/protocol/file/FileURLConnection.java

@@ -23,12 +23,6 @@
  * questions.
  */
 
-/**
- * Open an file input stream given a URL.
- * @author      James Gosling
- * @author      Steven B. Byrne
- */
-
 package sun.net.www.protocol.file;
 
 import java.net.URL;
@@ -40,6 +34,11 @@ import sun.net.www.*;
 import java.util.*;
 import java.text.SimpleDateFormat;
 
+/**
+ * Open a file input stream given a URL.
+ * @author      James Gosling
+ * @author      Steven B. Byrne
+ */
 public class FileURLConnection extends URLConnection {
 
     private static final String CONTENT_LENGTH = "content-length";

src/java.base/share/classes/sun/net/www/protocol/https/AbstractDelegateHttpsURLConnection.java

@@ -1,4 +1,4 @@
-/**
+/*
  * Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -65,7 +65,7 @@ public abstract class AbstractDelegateHttpsURLConnection extends
 
     protected abstract javax.net.ssl.HostnameVerifier getHostnameVerifier();
 
-    /**
+    /*
      * No user application is able to call these routines, as no one
      * should ever get access to an instance of
      * DelegateHttpsURLConnection (sun.* or com.*)