From the "General" section of the R22 POH:
Hover control has been substantiated in 17 knot wind from any direction up to 9,800 feet density altitude. Refer to IGE hover performance data for allowable gross weight.
So it's not a limitation - I read it as stating that it complies with the relevant FAA standard. And - being pedantic/frivolous - surely we need more than a 17 knot limit anyway in normal cruise flight of 70 - 80 knots !