This question has been edited whilst I was answering (or just after, or just before). I know it's changed (there were formatting issues previously), yet the edit doesn't show. This also makes me look a little silly as I believe the question wasn't originally tagged as [iphone] (as I have that as an ignored tag)
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It was probably edited within the 5 minutes grace period after the original post.
This was introduced because many people write their question or answer, post it and the minute it appears on the screen see that they made a stupid mistake. (I know it happenes to me quite often). Correcting these mistakes within the grace period has the effect of not counting for automatic wiki mode (I think it was 5 edits after which your post is automatically put into wiki mode).