update doc: BN_bn2lebinpad() and BN_bn2nativepad()
@@ -91,7 +91,7 @@ if B<ret> is NULL.
BN_bn2bin() returns the length of the big-endian number placed at B<to>.
BN_bin2bn() returns the B<BIGNUM>, NULL on error.
-BN_bn2binpad() returns the number of bytes written or -1 if the supplied
+BN_bn2binpad(), BN_bn2lebinpad(), and BN_bn2nativepad() return the number of bytes written or -1 if the supplied
buffer is too small.
BN_bn2hex() and BN_bn2dec() return a NUL-terminated string, or NULL
