Code review comment for lp:~mir-team/mir/consolidate-crossbuild-scripts

> I know it's just a test right now. But the name "consolidate-crossbuild-
> scripts" implies only script changes, and maybe docs. So this change looks out
> of place:
>
> === modified file 'tests/mir_test_framework/signal_dispatcher.cpp'

updated the descriptions to bring attention to it.