Update example

index.bs

@@ -1882,8 +1882,9 @@ To obtain the <dfn export for=node>context origin</dfn> of a [=node=] |node|:
     [=navigable/active document=]'s [=origin=].
 
 Note: The user agent may return the embedded origin to allow separate limits
-for specific use cases. Embedded origin could be the effective top-level origin,
-e.g. the origin of the website displayed in the AMP viewer.
+for specific use cases. Embedded origin could be the effective top-level origin.
+For example, https://foo.example/bar.example is embedded within https://foo.example,
+where https://foo.example is the top-level origin and https://bar.example is the embedded origin.
 
 <h3 id="obtaining-randomized-response">Obtaining a randomized response</h3>