Update index.asciidoc (#6956) (#6978)

(cherry picked from commit 3a4e7dd)

Co-authored-by: Janeen Mikell Roberts <[email protected]>

Author: mergify[bot]

docs/index.asciidoc

@@ -16,7 +16,7 @@
 :beats-dir:    {beats-root}
 
 [[elastic-endpoint]]
-= Elastic Security Solution
+= Elastic Security
 
 include::{asciidoc-dir}/../../shared/versions/stack/{source_branch}.asciidoc[]
 include::{asciidoc-dir}/../../shared/attributes.asciidoc[]