docs(power): refine proprietary license wording in [POWER.md] (#7)

Signed-off-by: Amol Mane <22643905+cx-amol-mane@users.noreply.github.com>

Author: cx-amol-mane

checkmarx-power/POWER.md

@@ -361,7 +361,7 @@ Here's the updated Dockerfile..."
 
 ## Checkmarx MCP License and Support
 
-This power integrates with Checkmarx MCP Server.
+This power integrates with Checkmarx MCP Server (Proprietary).
 
 - [Privacy Policy](https://checkmarx.com/legal/privacy-policy/)
 - [Support](https://support.checkmarx.com/CheckmarxCustomerServiceCommunity/s/)