Merge pull request #2248 from pepness/jdk-16-javadoc

[NETBEANS-4572] - Add javadoc for JDK 16 early access

java/java.j2seplatform/src/org/netbeans/modules/java/j2seplatform/platformdefinition/J2SEPlatformDefaultJavadocImpl.java

@@ -64,6 +64,7 @@ public final class J2SEPlatformDefaultJavadocImpl implements J2SEPlatformDefault
         OFFICIAL_JAVADOC.put("13", "https://docs.oracle.com/en/java/javase/13/docs/api/"); // NOI18N
         OFFICIAL_JAVADOC.put("14", "https://docs.oracle.com/en/java/javase/14/docs/api/"); // NOI18N
         OFFICIAL_JAVADOC.put("15", "https://download.java.net/java/early_access/jdk15/docs/api/"); // NOI18N Early access
+        OFFICIAL_JAVADOC.put("16", "https://download.java.net/java/early_access/jdk16/docs/api/"); // NOI18N Early access
     }
 
     @Override