Java Plug-in Demonstration Applets page (bundled in 6u21 jdk release) has 3 invalid links

* Steps to reproduce:
1) Install jdk 6u21 bundle (either SE or J4B)
2) From the installed jdk dir (/jdk1.6.0_21), load the <applets.html> page:
/jdk1.6.0_21/demo/applets.html
/jdk1.6.0_21/demo/plugin/applets.html

The following 3 references are invalid (404-not found pages)
- "FAQ" (second link at the top)
- "Documentation" (third link at the top)
- "Compatibility with Previous Releases" (in the third paragraph from the top)