Editorial: use origin-based "schemelessly same site"

Follows whatwg/html#5076. See
#969 for a potential normative
follow-up to change this to use "same site".

fetch.bs

@@ -3112,8 +3112,8 @@ Cross-Origin-Resource-Policy     = %s"same-origin" / %s"same-site" ; case-sensit
   <p>If the following are true
 
   <ul class=brief>
-   <li><var>request</var>'s <a for=request>origin</a>'s <a for=url>host</a> is <a>same site</a> with
-   <var>request</var>'s <a for=request>current URL</a>'s <a for=url>host</a>
+   <li><var>request</var>'s <a for=request>origin</a> is <a>schemelessly same site</a> with
+   <var>request</var>'s <a for=request>current URL</a>'s <a for=url>origin</a>
    <li><var>request</var>'s <a for=request>origin</a>'s <a for=url>scheme</a> is
    "<code>https</code>" or <var>response</var>'s <a for=response>HTTPS state</a> is
    "<code>none</code>"