On 8171135: Include javadoc on JarSigner API in security doc

[Wang Weijun]

Hi All

I've create a new bug to include the javadoc of the non-Java SE JarSigner API 
into security doc:

   https://bugs.openjdk.java.net/browse/JDK-8171135

If you think this is OK, I'll move the bug to doc.

Thanks
Max