docs(srv): add info on env var precedence MTA-6144 (#5108)

* docs(srv): add info on env var precedence MTA-6144

* Update pages/serverless-functions/concepts.mdx

Co-authored-by: Néda <[email protected]>

* Update pages/serverless-containers/concepts.mdx

Co-authored-by: Néda <[email protected]>

---------

Co-authored-by: Néda <[email protected]>

Author: SamyOubouaziz

pages/serverless-containers/concepts.mdx

@@ -96,7 +96,9 @@ An endpoint is the URL generated to access your resource. It can be customized w
 
 ## Environment variables
 
-Environment variables are key/value pairs injected in your container. They are useful to share information such as configurations with your container. Some names are reserved. [See details about reserved names](/serverless-containers/reference-content/containers-limitations/#configuration-restrictions).
+Environment variables are key/value pairs injected into your container. They are useful to share information such as configurations with your container. Environment variables defined at the container level override the ones defined at the namespace level if they have the same name.
+
+Some names are reserved. [See details about reserved names](/serverless-containers/reference-content/containers-limitations/#configuration-restrictions).
 
 ## Ephemeral storage
 
@@ -226,7 +228,7 @@ When provisioned with a [minimum scale](#min-scale) of `0`, Serverless Container
 
 ## Secrets
 
-Secrets are an extra-secure type of environment variable. They are environment variables that are injected into your container and stored securely, but not displayed in the console after initial validation.
+Secrets are an extra-secure type of environment variable. They are environment variables that are injected into your container and stored securely, but not displayed in the console after initial validation. Secrets defined at the container level override the ones defined at the namespace level if they have the same name.
 
 For more details about Serverless advantages, [read Serverless Overview](/serverless-containers/reference-content/serverless-overview/).
 

pages/serverless-functions/concepts.mdx

@@ -56,7 +56,9 @@ An endpoint is the URL generated to access your resource. It can be customized w
 
 ## Environment variables
 
-Environment variables are key/value pairs injected in your container. They are useful for sharing information such as configurations with your container. Some names are reserved. [See details on reserved names](/serverless-functions/reference-content/functions-limitations/#configuration-restrictions).
+Environment variables are key/value pairs injected into your container. They are useful for sharing information such as configurations with your container. Environment variables defined at the function level override the ones defined at the namespace level if they have the same name.
+
+Some names are reserved. [See details on reserved names](/serverless-functions/reference-content/functions-limitations/#configuration-restrictions).
 
 ## GB-s
 
@@ -161,6 +163,8 @@ When provisioned with a [minimum scale](#min-scale) of `0`, Serverless Functions
 
 Secrets are an extra-secure type of environment variable. They are environment variables that are injected into your function and stored securely, but not displayed in the console after initial validation.
 
+Secrets defined at the function level override the ones defined at the namespace level if they have the same name.
+
 ## Serverless
 
 Serverless allows you to deploy your Functions (FaaS) and Containerized Applications (CaaS) in a managed infrastructure. Scaleway ensures the deployment, availability, and scalability of all your projects.