link fix

index.html

@@ -1376,7 +1376,7 @@ <h4><span data-lang="en">Footnote Application in Multi-Column</span> <span data-
         <li>
           <p data-lang="en">Showing all the footnotes in a column on the right side.</p>
           <p data-lang="ko">맨 오른쪽 단에 모아서 표시한다.</p>
-          <figure> <img src="ko/images/5-3.png" alt="" />
+          <figure> <img src="ko/images/5-3.PNG" alt="" />
             <figcaption><span data-lang="en">Right side column</span> <span data-lang="ko">오른쪽 단에 모아서 표시</span></figcaption>
           </figure>
         </li>