Update 25_figures.html

Author: sonnynomnom

4-semantic-html/25_figures.html

@@ -38,7 +38,7 @@ <h3>Title</h3>
         </article>
         <br/><hr/><br/>
         <article>
-          <!-- From Challenge 25 -->
+          <!-- From Exercise 25 -->
           <figure>
             <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
             <figcaption>A piece of obsidian</figcaption>
@@ -48,7 +48,7 @@ <h3>Title</h3>
         </article>
         <br/><hr/><br/>
         <article>
-          <!-- From Challenge 25 -->
+          <!-- From Exercise 25 -->
           <figure>
             <img style="width: 150px;" src="https://cdn.pixabay.com/photo/2014/10/27/18/32/obsidian-505332_960_720.jpg" alt="Obsidian" />
             <figcaption>A piece of obsidian</figcaption>