Apply Michael's suggestions from code review

Co-authored-by: Michael Kleber <[email protected]>

Author: jyasskin

index.html

@@ -176,8 +176,7 @@ <h2>Definitions</h2>
       <p>
         <dfn data-lt="cross-party ad targeting|">Cross-party targeted
         advertising</dfn> means showing a person advertisements, where the advertisement is selected
-        based on data about that person that was gathered from any party other than the
-        one the person intends to interact with when they are shown the advertisement.
+        based on data about that person that was gathered over time and across parties.
       </p>
     </section>
     <section>