#100 Fix TSIG Javadocs

[David Xia]

I noticed a couple of javadoc warnings when running mvn verify. This is my first time trying to submit a patch to a project hosted on Sourceforge. Apologies if I'm not following any conventions. I'm used to git+github.

Fix TSIG Javadocs

This change fixes two Javadoc warnings that show up when running mvn verify.

```
[WARNING] Javadoc Warnings

[WARNING] /Users/dxia/src/dnsjava/./org/xbill/DNS/TSIG.java:140: warning - @param argument "key" is not a parameter name.

[WARNING] /Users/dxia/src/dnsjava/./org/xbill/DNS/TSIG.java:170: warning - @param argument "Name" is not a parameter name.
```

[Brian Wellington]

Fixed. Thanks!

[Ingo]

Ticket moved from /p/dnsjava/patches/36/