fix(bil): remove instance (scaleway#3940)

* feat(bil): gp and dev mention

* fix(bil): remove mention instance

Author: ldecarvalho-doc

console/billing/additional-content/understanding-savings-plans.mdx

@@ -93,7 +93,7 @@ There is currently one available Savings Plan type: the Compute Savings Plan.
 The **Compute Savings Plan** can be used with the following resources, simultaneously and across all regions:
 
     - Instances 
-      - Cost-optimized (DEV1, GP1, COPARM1, PLAY2, PRO2)
+      - Cost-optimized (DEV1, GP1, PLAY2, PRO2)
       - Production optimized (ENT1, POP2)
       - Workload optmized (POP2 HC)