More polite initial_values_responder msg

[mpadge]

@xuanxu Just got a response to an initial submission, and all worked perfectly which is great, but it seemed a bit harsh to me to have the first statement from the bot being "Missing values". Something like this would make it more polite :smile:

[xuanxu]

I like this, as it is a regular responder let me add it to upstream and pull it from there

[mpadge]

Thanks @xuanxu - this one is uniquely important only because it is the very first bot response to new templates if they're missing variables, so needs to be particularly polite and nice.

[xuanxu]

Changed in ropensci branch via upstream's main!