removing reference to performance HR

see w3c/strategy#467 (comment)

index.html

@@ -446,7 +446,7 @@ <h2>Success Criteria</h2>
       <section id="coordination">
         <h2>Coordination</h2>
         <p>For all specifications, this Working Group will seek <a href="https://www.w3.org/Guide/documentreview/#how_to_get_horizontal_review">horizontal review</a> for
-          accessibility, internationalization, performance, privacy, and security with the relevant Working and
+          accessibility, internationalization, privacy, and security with the relevant Working and
           Interest Groups, and with the <a href="https://www.w3.org/2001/tag/" title="Technical Architecture Group">TAG</a>.
           Invitation for review must be issued during each major standards-track document transition, including
           <a href="https://www.w3.org/Consortium/Process/#RecsWD" title="First Public Working Draft">FPWD</a>.  The