aws/signer/v4: Correct wording for v4 signer's docs
@@ -402,7 +402,7 @@ var SignRequestHandler = request.NamedHandler{
}
// SignSDKRequest signs an AWS request with the V4 signature. This
-// request handler is bested used only with the SDK's built in service client's
+// request handler should only be used with the SDK's built in service client's
// API operation requests.
//
// This function should not be used on its on its own, but in conjunction with
