I tend to go with something like this:
"Hey there! Watch out for your homophones like 'you're' and 'your,' as well as 'rite and right.' Also, you may want to try and use a few less exclamation marks; they lose their meaning if they're after every sentence!'
But I know that some editors go:
"In paragraph one I changed 'You're toy' to 'your toy.' In paragraph two I changed 'Your sure to like it' to 'You're sure to like it.' In paragraph 3 I added a comma after 'nice.'" Etc.
Which do you guys find more useful? Thanks for your input, I'm trying to be a more helpful editor!