The Dev rules and Guidelines http://code.google.com/p/zaproxy/wiki/DevGuidelines state "Do not format/indent the code on the same commit as code changes, either format before or after committing the code changes."
I think its worth extending that to changing unrelated comments - these things make it very difficult to see the important changes when reviewing code.
Not a problem for this pull request, but worth beating in mind for future ones :)