Fix @see links in documentation

All of the deep links in the docs (`@see http://`) are "broken", because `developer.github.com` site redirects all `http` to `https`, breaking the deep links:

- http://developer.github.com/v3/#authentication becomes
  http://developer.github.com/v3

This commit simply mass-find-and-replaced all the `@see http://` with `@see https://`. I checked a few but not all.