The old copy can be seen on the wayback machine here, and I've pasted it below:
Sharing of Access Tokens
Our Data Policies explicitly prohibit any sharing of an Access Token for your app with any other app. However, we do allow developers to share Tokens between a native implementation and a server implementation of the same App (ie. using the same App ID) as long as the transfer takes place using HTTPS.
Link in "ATTENTION" section of docs/4-example-server-side-facebook-login-using-mobile-apps redirects to a new page that doesn't contain information about SSL requirements.
https://developers.facebook.com/docs/concepts/login/access-tokens-and-types/ now redirects to: https://developers.facebook.com/docs/facebook-login/overview/
The old copy can be seen on the wayback machine here, and I've pasted it below:
Sharing of Access Tokens
Our Data Policies explicitly prohibit any sharing of an Access Token for your app with any other app. However, we do allow developers to share Tokens between a native implementation and a server implementation of the same App (ie. using the same App ID) as long as the transfer takes place using HTTPS.