[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.