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libauthsrv: fix ed448 goldilocks prime comment

--- a/sys/src/libauthsrv/ed448.mp

+++ b/sys/src/libauthsrv/ed448.mp

@@ -1,7 +1,7 @@

 # Edwards Curve Ed448-Goldilocks

 # x^2+y^2 = 1-39081x^2y^2

-# modulo p = 2^448 - 1^224 - 1

+# modulo p = 2^448 - 2^224 - 1

 ed448_curve(p,a,d,x,y) {

 	p = (1<<448) - (1<<224) - 1;

 	a = 1;