fix tests list

neps/nep-0488.md

@@ -560,7 +560,7 @@ This section aims to validate the handling of incorrect input data:
 
 - Incorrect input length.
 - Incorrect sign value (not 0 or 1).
-- Erroneous coding of field elements, resulting in a correct point on the curve if only the suffix is considered.
+- Erroneous coding of field elements: one of the first three bits set up incorrectly.
 - Erroneous coding of field elements resulting in a correct element on the curve modulo p.
 - Erroneous coding of field elements with an incorrect extra bit in the decompressed encoding.
 - Point not on the curve.