I think you're going to do this - K1,P1,K1 - all into the next st. Knit the st but leave it on the L needle, bring yarn to front and purl, take yarn to back and knit it again. This makes a double inc to offset the p3tog double dec. It may be easier to k1, yo, k1 into the st and will look the same.
sue- knitting heretic
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I think the parentheses have been omitted in error. It still makes sense to k1, p1, k1 all into the next stitch. That balances out the decrease when you p3tog. Here is a video of how to do that if you'd like.