Update index.html

fixing more typos

Author: sally-martinez

index.html

@@ -1181,7 +1181,7 @@ <h1>Module for MSU's Middle School Girls Math and Science Day</h1>
 <h3 id="outreachPenguinChallenge">Penguin Challenge</h3>
 <section class="example">
   <section class="title">
-    <h1>Activity for Rockwern Elementary Elementary School Students Science Day</h1>
+    <h1>Activity for Rockwern Elementary School Students Science Day</h1>
     <img src="assets/images/penguin_challenge.png" height="266" width="200">
   </section>
   <section class="content">
@@ -1192,7 +1192,7 @@ <h1>Activity for Rockwern Elementary Elementary School Students Science Day</h1>
       A major goal of scientific research is to be accurate and reproducible. Through this activity, students will learn important context relating to accuracy and reproducibility of scientific research, such as the concepts of estimation, repeated surveys, and more.  
     </p>
     <p>
-      <strong>Materials</strong> - <a href="https://github.com/zipkinlab/PenguinChallenge">Link to materials</a>
+      <strong>Materials</strong> - <a href="https://github.com/zipkinlab/Penguin-Challenge">Link to materials</a>
       <br>
     </p>
   </section>