As far as I can tell there has never been a 'dontcache' parameter in search.php (at least not in any 3.x version). I think it was something that was customised into vb.org code deep in the past and the link has never been updated.
I'm doubtful it did anything even while vb.org was running 3.0 - since the whole seach results display system depends on the 'caching' functionality - results are displayed by supplying the searchid, not directly.
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