fix typo

EIPS/eip-2537.md

@@ -323,7 +323,7 @@ Algorithms and set of parameters for SWU mapping method is provided by a separat
 
 Due to the large test parameters space we first provide properties that various operations must satisfy. We use additive notation for point operations, capital letters (`P`, `Q`) for points, small letters (`a`, `b`) for scalars. Generator for G1 is labeled as `G`, generator for G2 is labeled as `H`, otherwise we assume random point on a curve in a correct subgroup. `0` means either scalar zero or point of infinity. `1` means either scalar one or multiplicative identity. `group_order` is a main subgroup order. `e(P, Q)` means pairing operation where `P` is in G1, `Q` is in G2.
 
-Requeired properties for basic ops (add/multiply):
+Required properties for basic ops (add/multiply):
 
 - Commutativity: `P + Q = Q + P`
 - Additive negation: `P + (-P) = 0`