fix typo: Update navigation.html

Signed-off-by: Andreas Fehlner <fehlner@arcor.de>

Author: andife

partials/navigation.html

@@ -47,7 +47,7 @@
       <a class="dropdown-item" href="https://twitter.com/onnxai">Twitter</a>
       <a class="dropdown-item" href="https://www.facebook.com/onnxai/" target="_blank">Facebook</a>
       <a class="dropdown-item" href="https://github.com/onnx/onnx/discussions" target="_blank">Github Discussion</a>
-      <a class="dropdown-item" href="https://wiki.lfai.foundation/pages/viewpage.action?pageId=18481196" target="_blank">Calender</a>
+      <a class="dropdown-item" href="https://wiki.lfai.foundation/pages/viewpage.action?pageId=18481196" target="_blank">Calendar</a>
       <a class="dropdown-item" href="https://www.youtube.com/onnxai">Youtube</a>
       <a class="dropdown-item" href="https://wiki.lfaidata.foundation/">Wiki (LF AI & Data)</a>
     </div>