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It's funny because the document you've linked to says this:That's so wrong! Who told you that? Don't do that mistake in exams they will penalize you for this.
You never came across an uncertainty with +- 0.25 or +-1.5 in any question paper? You must keep working more papers then.
These are 2s.f btw
More info here http://facultyfiles.deanza.edu/gems/lunaeduardo/UncertaintyandSignificantFig.pdf
"Experimental uncertainties should be stated to 1-significant figure."
I can also confirm this, uncertainties should be stated to 1 sig from what I learnt last year in AS