Explicitly note that upgrade steps for specific versions are additional to the regular upgrade procedure

Author: rzetelskik

docs/source/management/upgrading/upgrade.md

@@ -55,6 +55,9 @@ Replace `<release_name>` with the name of your Helm release for {{productName}}
 
 ## Upgrade steps for specific versions
 
+The below instructions are **supplementary** to the standard upgrade procedure and don't fully replace it.
+Make sure to familiarize yourself with both the standard upgrade procedure and the additional steps for the specific version you are upgrading to, if applicable, and follow them accordingly.
+
 ### 1.17 to 1.18
 
 Upgrading from v1.17.x requires extra actions due to the removal of the standalone ScyllaDB Manager controller.