fix(srv): add info on function concurrency

Author: SamyOubouaziz

pages/serverless-functions/concepts.mdx

@@ -41,7 +41,7 @@ Startup process steps are:
 
 ## Concurrency
 
-Concurrency defines the capacity of a resource to process several requests at the same time. A single instance of a function has a concurrency of `1` as it handles requests  sequentially, one by one, but a Serverless Function can have several instances running in parallel, depending on its [scaling](#scaling) configuration.
+Concurrency defines the capacity of a resource to process several requests at the same time. A single instance of a function has a concurrency of `1` as it handles requests  sequentially, one by one, but a Serverless Function can have several instances running in parallel, depending on its [autoscaling](#autoscaling) configuration.
 
 ## Container Registry