changed one sentence and realized there are a ton of contigencies

I'd love to edit directly, but this thing is a bit confusing to me. So until someone has a minute to tell me where I can edit certain things without breaking anything, I'll switch back to github issues and cry about my non committing.
Since @LauraHilliger installed mongo inside her appmaker directory, it was trying to add the files / folders as part of her commits.

I'm going to merge this because I don't like seeing it sitting here. We should revisit the README together maybe, but as it stands, this is still a slight improvement to the copy as it at least prevents people from running into @LauraHilliger's problem.