index.html: Fix version typo.

Noted by Zhuyie <zhuyie@gmail.com>.

index.html

@@ -101,7 +101,7 @@
           <p>This is a maintenance release with no significant
             changes.  For more details on the various fixes and
             changes please
-            see <a href="https://sourceforge.net/projects/freetype/files/freetype2/2.11.0/">here</a>.</p>
+            see <a href="https://sourceforge.net/projects/freetype/files/freetype2/2.11.1/">here</a>.</p>
 
           <h4>FreeType 2.11.0</h4>
           <div class="date">2021-07-19</div>