Embed Notice

One of the thing that drives me nuts is when related code is separated from itself in a single function. E.g.
```
params.stateless_reset_token_present = 1;
[unrelated settings and other code]
if (ngtcp2_crypto_generate_stateless_reset_token(
params.stateless_reset_token, config.static_secret.data(),
config.static_secret.size(), &scid_) != 0) {
return -1;
}
```

Like set the reset_token_present value when you generate the reset token!