sorry, but disliking swear words seem outdated to me. whats so bad about one or two swears in the entire manual? everyone ages 13 and up knows some of them. i knew mine since 8 or 9.
professionalism makes me want to puke. what is so bad about not being professional? sheesh.
It's all about context. If it was a blog, a preview that was trying to hype the game, a review etc. then all that fun stuff is fine. A few lighthearted comments in the manual are also fine, but there's a certain standard that is expected from professional documentation/communication. If you went to a doctor that was unprofessional, making snide/smartalec comments it wouldn't instill much confidence in them, but if you were friends with them you wouldn't want them to act professional while you were hanging out.
By letting things slide you'll get to the point where the manual states:
"u can pwn ur nmes with ur roflcopters, lol"