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For all the WS values on the Assault To Hit Chart, the attacker requires 3+'s for any values below it's own WS, and 4+'s for values equal, values one higher and values two higher than it's own WS.

All WS values that is except 1.  For Attackers WS of 1, if the enemy has 3 WS the attacker requires a 5, but going by the rest of the chart it should be a 4+.  This is repeated in the appendix as well as in the main rules for Assaults.

Was this intentional?  Or a typo in two places?

It is correct. If the target has more than double the WS of the attacker, you need a 5+ to hit.

Godhead, your understanding of the chart is flawed.

You wrote that it requires 4s for values equal, one higher, and two higher.

In actuality, it is 4s for equal and up to twice your WS value and 5s for more than double.

So WS 3 hits WS 6 on 4s, but WS 7 on 5s.

WS 1 hits WS 1 and 2 on 4s, but WS 3 or better on 5s.