RFR [9] 8079478: some docs cleanup for sun.security

[alexander stepanov]

Hello,

Could you please review the following fix
http://cr.openjdk.java.net/~avstepan/8079478/webrev.00/

for
https://bugs.openjdk.java.net/browse/JDK-8079478

Just some doc fixes.

Please note: not sure if these docs should be fixed at all because in 
the new modular system these packages should (probably) not be visible.

So please let me know if the fix is useless.

Thanks,
Alexander