evalperf: add some notes

Author: ganler

evalperf.html

@@ -132,7 +132,12 @@ <h3>Win-rate Leaderboard</h3>
           <table id="leaderboard"
             class="table table-responsive table-striped table-bordered flex-shrink-1 border border-5">
           </table>
+          <p>🏪 The detailed model generation data and results are available at our page <a
+              href="https://github.com/evalplus/evalplus.github.io/tree/main/results/evalperf">repository</a>.</p>
+          <p>💸 We use 50 samples (half) for o1 model series for cost saving; also because it's easy to sample desired
+            amount of correct samples from strong models using less tries.</p>
 
+          <br>
           <h3>Heatmap of Pairwise DPS Comparison</h3>
           <div class="row w-100">
             <div class="col-12">