Inform that console management must be active for decision management (#776)

* Inform that console management must be active for decision management
* Update crowdsec-docs/unversioned/console/decisions/decisions_management.md

fixed carriage return

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Co-authored-by: jdv <julien@crowdsec.net>

Author: rr404

crowdsec-docs/unversioned/console/decisions/decisions_management.md

@@ -4,6 +4,11 @@ title: Decisions Management
 sidebar_position: 1
 ---
 
+:::info
+This feature needs the *console_management* feature activated on your Security Engine.  
+Activate it to make sure actions from the **decision management** are applied **immediately**.  
+Check the instructions to activate it [HERE](/u/console/decisions/decisions_intro).
+:::
 ## Console Management
 
 CrowdSec Local API is able to receive or delete local decisions from the Console.