Update landing-page banner to release 22.09 (#280)

Author: sbernauer

modules/ROOT/pages/index.adoc

@@ -6,9 +6,9 @@ This documentation gives you an overview of the Stackable Data Platform, how to
 
 
 [NOTE]
-.Our first release - June 2022
+.Our second release - September 2022
 ====
-We are proud to announce our first public release!
+We are proud to announce our second public release!
 
 Please read the xref:release_notes.adoc[release notes] to read up on the details.
 ====