fix(serverless): instance number (scaleway#4048)

Author: thomas-tacquet

serverless/containers/concepts.mdx

@@ -98,7 +98,7 @@ One of the advantages of Serverless Containers is that when your container is no
 
 ## Scaling
 
-Serverless Containers make scaling your application transparent, up to 20 instances of your container can be run at the same time.
+Serverless Containers make scaling your application transparent, up to 50 instances of your container can be run at the same time.
 
 ## Secrets
 

serverless/functions/concepts.mdx

@@ -78,7 +78,7 @@ One of the advantages of Serverless Functions is that when your function is not
 
 ## Scaling
 
-Serverless Functions make scaling your application transparent, up to 20 instances of your function can be run at the same time.
+Serverless Functions make scaling your application transparent, up to 50 instances of your function can be run at the same time.
 
 ## Secrets