docs: reference environment key and auth (#6475)

Co-authored-by: Jakob Holmgren <jakobholmgren@Jakobs-MacBook-Pro.local>

Author: Holmus

docs/docs/edge-api/Overview.md

@@ -9,7 +9,7 @@ sidebar_label: Overview
 
 The Edge API is designed to be publicly accessible. Calls need to have an environment key supplied with each request.
 This is provided as an HTTP header, with the name `X-Environment-Key` and the value of the Environment Key that you can
-find within the Flagsmith administrative area.
+find within the Flagsmith administrative area. See [Flags API Authentication](/integrating-with-flagsmith/flagsmith-api-overview/flags-api/authentication) for more details.
 
 ## Core API
 

docs/docs/integrating-with-flagsmith/flagsmith-api-overview/flags-api/authentication.md

@@ -3,7 +3,7 @@ title: Authentication
 sidebar_label: Authentication
 ---
 
-The Flags API uses a non-secret **Environment Key** for authentication. This key is safe to be exposed in public, client-side applications.
+The Flags API uses a non-secret **Environment Key** for authentication. This key is safe to be exposed in public, client-side applications. See [Integration Approaches](/best-practices/integration-approaches#client-side-sdk-flag-endpoints-are-public) for security best practices when using client-side keys.
 
 ## Finding Your Environment Key
 

docs/docs/integrating-with-flagsmith/flagsmith-api-overview/flags-api/code-examples.md

@@ -3,7 +3,7 @@ title: Code Examples
 sidebar_label: Code Examples
 ---
 
-Here are some `curl` examples demonstrating how to interact directly with the Flags API.
+Here are some `curl` examples demonstrating how to interact directly with the Flags API. See [Authentication](/integrating-with-flagsmith/flagsmith-api-overview/flags-api/authentication) for details on how to obtain and use your Environment Key.
 
 ### Get Environment Flags