Er ... sorry to be pedantic(!), but Yorkslad12's apostrophe wasn't superfluous - it was incorrect.
Superfluous means unnecessary, usually in the way of being more than enough. But it doesn't alter the actual meaning of the words used. A bit like saying something is damp and moist. You don't
need to use both words, they mean the same thing, but the meaning of the whole sentence is still clear.
However, "
pedant's" means belonging to a pedant (and, significantly, just one pedant), whereas "
pedants" (which I believe is what was intended) is the plural form of "pedant" - so more than one pedant.
So the question in response to
@YorksLad12 should perhaps have been "You believe this forum to be full of pedant's ... what? Thoughts? ideas? Musings? Nonsense?"
Below is a picture of a real-world example, from an advert for a loyalty card valid on the Wrexham - Oswestry bus service:
View attachment 91415
In this example, "
journey's" should read "
journeys".
Not that I'm a pedant, of course!