Update Sources/ComplexModule/Arithmetic.swift

Co-authored-by: Xiaodi Wu <[email protected]>

Author: stephentyrone

Sources/ComplexModule/Arithmetic.swift

@@ -179,7 +179,7 @@ extension Complex: AlgebraicField {
   ///
   /// Error Bounds:
   /// -
-  /// Unlike real types, when working with complex types multiplying by the
+  /// Unlike real types, when working with complex types, multiplying by the
   /// reciprocal instead of dividing cannot change the result. If the
   /// reciprocal is non-nil, the two computations are always equivalent.
   @inlinable