Update comments in `_print.scss` file

Use correct terminology and remove the outdated parts of the comments.

See also:

  * JavaScript URIs:
    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void#JavaScript_URIs

  * URL fragments:
    http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html#scroll-to-fragid

  * `href` attribute:
     http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#attr-link-href
     https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-href