update iwp docs

doc/iwp_v0.txt

@@ -40,10 +40,10 @@ handshake:
 32 bytes random padding, r (for future handshake use)
 32 bytes hmac, h
 32 bytes nounce, n
-32 bytes alice's transport public encryption key, a.k
+32 bytes encrypted alice's transport public encryption key, SE(a.k, HS(b.k + n))
 variadic bytes padding, w0
 
-Alice transmits ( r + h + n + a.k + w0 ) to Bob from the transport address matching
+Alice transmits ( r + h + n + SE(a.k, HS(b.K + n)) + w0 ) to Bob from the transport address matching
 his public transport encryption key (b.k).
 
 w0 = "[insert variable length random padding here]"