Update definitions of "site" and "same site" per HTML standard

Co-authored-by: Jeffrey Yasskin <[email protected]>

Author: SebastianZimmeck

index.html

@@ -147,8 +147,8 @@ <h2>Introduction</h2>
         However, while the Global Privacy Control is designed to allow users to express a preference to opt out
         of sharing and cross-context targeted advertising, the control is not intended to exercise every possible
         privacy right, nor even every right to opt out of advertising or ad targeting. GPC is not designed to
-        exercise deletion rights, for example. GPC is also not designed to address same-site data collection and
-        same-site ad targeting. For more details, see the
+        exercise deletion rights, for example. GPC is also not designed to address [=same site=] data collection and
+        [=same site=] ad targeting. For more details, see the
         <a href="https://w3c.github.io/gpc/explainer" target="_blank">Legal and Implementation Considerations Guide</a>
       </p>
       <p>