Google has an incredible light weight ranking signal around going HTTPS with your site. Google has been pushing websites to go HTTPS as a matter of principle and security. Menashe Avramov noticed and shared on Google+ that Google’s updated canonical URLs documentation now uses HTTPS in their URL examples instead of HTTP.
Here is a snippet:-
Menashe Avramov actually documented and highlighted the before and after with these highlights in the embed below.Google Updates Canonical Documentation To Show HTTPS URLs!,