This is the old "use singular" rule for OSM tags, of which I don't know the origins and I don't know whether it applies here. In the English language a "woodchip surface" is made from "woodchips". So one could argue for either version I suppose.
Anyway: http://wiki.openstreetmap.org/wiki/Tag:leisure%3Dplayground refers to surface=woodchip (singular) The same for the translated playground pages. The "surface" wiki pages give "woodchips" (plural) as surface tag value. This means the wiki needs adjusting as well in addition to any re-tagging.
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