Remove redundant line

A quote was repeated twice in one example.

index.html

@@ -1472,6 +1472,7 @@
 
   > It is better to approach [these use cases] with replacement technologies
   that are designed-for-purpose and built to respect user privacy.
+  [[?web-without-3p-cookies]]
 
   For example, they might reveal a performance metric for a website directly
   instead of requiring it to be computed from the timing of
@@ -1480,10 +1481,6 @@
   When designing an API like this, aim to ensure that the data it exposes
   doesn't make it cheaper to compute information about people than it would
   have been through other methods.
-
-  > It is better to approach [these use cases] with replacement technologies
-  that are designed-for-purpose and built to respect user privacy.
-  [[?web-without-3p-cookies]]
 </aside>