[DOCS] Shortens title.

Author: szabosteve

docs/index-custom-title-page.html

@@ -57,7 +57,7 @@
     <div class="col-md-6 col-12">
       <p></p>
       <p>
-        <h2>Documentation for the official Java client</h2>
+        <h2>Documentation</h2>
       </p>
       <p>
         The Java API client provides strongly typed requests and responses for all Elasticsearch APIs.