There are two things to check.
The first is to check whether the changelog being generated has the
correct case. Hopefully it should. Once you have confirmed that, there
is an attribute you can apply to individual change sets to set the
'quoting strategy' to be used. Here is an example:
I was just speaking with Nathan (benevolent dictator for life)
and he realized there isn't really a way to set that quoting
strategy globally on a changelog, so he is going to put that on
the list of feature requests.