Update installation instructions in markdown file

Signed-off-by: Piotr Gajek <piotr.gajek95@gmail.com>

Author: pgajek2

website/docs/docs/installation.md

@@ -5,6 +5,7 @@ sidebar_position: 20
 
 <!--
  sf package version create --package "SOQL Lib" --target-dev-hub beyondthecloud-prod --installation-key-bypass --wait 30 --code-coverage
+ 
  sf package version promote --package "SOQL Lib@6.6.0-1"  --target-dev-hub beyondthecloud-prod
 -->