In general, don't make changes unrelated to the bug you're working in.  We call these "spurious changes" because they make tracking down historical changes to the code harder (i.e., your change to the quote style eclipses the actual last change to this line).  If you want to fix something like this, file another bug for it.  Same for the other examples below.

NOTE: the actual changes are correct, it's just not good form to do it in this bug.  Make sense?