[zh] fix typo

Author: Arhell

content/zh/case-studies/appdirect/index.html

@@ -13,7 +13,7 @@
 ---
 
 <div class="banner1" style="background-image: url('/images/case-studies/appdirect/banner1.jpg')">
-  <h1> CASE STUDY:<img src="/images/appdirect_logo.png" class="header_logo" style="margin-bottom:-2%"><br> <div class="subhead" style="margin-top:1%;font-size:0.5em">AppDirect: How AppDirect Supported the 10x Growth of Its Engineering Staff with Kubernetess
+  <h1> CASE STUDY:<img src="/images/appdirect_logo.png" class="header_logo" style="margin-bottom:-2%"><br> <div class="subhead" style="margin-top:1%;font-size:0.5em">AppDirect: How AppDirect Supported the 10x Growth of Its Engineering Staff with Kubernetes
 </div></h1>
 
 </div>