Merge bitcoin-core/secp256k1#1246: Typo

d1e7ca1 Typo (roconnor-blockstream)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK d1e7ca1

Tree-SHA512: 0d53ad29cf86921a59aae3953c7d786b7ee0567c9cf92d037853e8c4f7536e45c6b50467eb95d3763f27ae3fd1a8b2b9cf88689f320cb13cebf52f70bb4affef

src/ecmult_impl.h

@@ -97,7 +97,7 @@ static void secp256k1_ecmult_odd_multiples_table(int n, secp256k1_ge *pre_a, sec
     secp256k1_gej_set_ge(&ai, &pre_a[0]);
     ai.z = a->z;
 
-    /* pre_a[0] is the point (a.x*C^2, a.y*C^3, a.z*C) which is equvalent to a.
+    /* pre_a[0] is the point (a.x*C^2, a.y*C^3, a.z*C) which is equivalent to a.
      * Set zr[0] to C, which is the ratio between the omitted z(pre_a[0]) value and a.z.
      */
     zr[0] = d.z;