Update index.md (#1036)

Related to elastic/docs-builder#950

---------

Co-authored-by: Kaarina Tungseth <[email protected]>

Author: reakaleek

Diff for: index.md

@@ -1,7 +1,7 @@
 ---
-navigation_title: Elastic documentation
+navigation_title: Elastic Docs
 layout: landing-page
 description: Official Elastic documentation. Explore guides for Elastic Cloud (Hosted and Serverless) or on-prem deployments. Find product documentation, how-to guides, troubleshooting tips, release notes, and more.
 ---
 
-# Elastic documentation
+# Elastic Docs