8213911: Use example.com in java.net and other examples

Reviewed-by: prappo, chegar, rriggs, mullan

src/java.base/share/classes/java/net/HostPortrange.java

@@ -60,7 +60,7 @@ class HostPortrange {
     HostPortrange(String scheme, String str) {
         // Parse the host name.  A name has up to three components, the
         // hostname, a port number, or two numbers representing a port
-        // range.   "www.sun.com:8080-9090" is a valid host name.
+        // range.   "www.example.com:8080-9090" is a valid host name.
 
         // With IPv6 an address can be 2010:836B:4179::836B:4179
         // An IPv6 address needs to be enclose in []