Fixed a docs warning

Author: Felix Hennig

docs/modules/hbase/pages/getting_started/installation.adoc

@@ -8,7 +8,7 @@ There are 2 ways to run Stackable operators
 
 1. Using xref:stackablectl::index.adoc[]
 
-1. Using Helm
+2. Using Helm
 
 === stackablectl