Change T to V for consistency
Change T to V for consistency

In expectation::Target we are using only U and V for template
arguments, so should here.

zhangsu/ccspec,tempbottle/ccspec,michaelachrisco/ccspec,michaelachrisco/ccspec,michaelachrisco/ccspec,zhangsu/ccspec,zhangsu/ccspec,tempbottle/ccspec,tempbottle/ccspec