v14 migration env vars

make note that the env vars from v14 won't be migrated

docs/content/advanced/migrate/from-14-to-15.md

@@ -6,22 +6,24 @@ This guide will help you migrate from `v14` to version `v15` of `wg-easy`.
 
 ## Changes
 
-- This is a complete rewrite of the `wg-easy` project. Therefore the configuration files and the way you interact with the project have changed.
+- This is a complete rewrite of the `wg-easy` project, therefore the configuration files and the way you interact with the project have changed.
 - If you use armv6, you unfortunately won't be able to migrate to `v15`.
-- If you are connecting to the web ui via HTTP, you need to set the `INSECURE` environment variable to `true` in the new container.
+- If you are connecting to the Web UI via HTTP, you need to set the `INSECURE` environment variable to `true` in the new container.
 
 ## Migration
 
 ### Backup
 
-Before you start the migration, make sure to backup your existing configuration files.
+Before you start the migration, make sure to back up your existing configuration files.
 
-Go into the Web Ui and click the Backup button, this should download a `wg0.json` file.
+Go into the Web UI and click the Backup button, this should download a `wg0.json` file.
 
 Or download the `wg0.json` file from your container volume to your pc.
 
 You will need this file for the migration
 
+You will also need to back up the old environment variables you set for the container, as they will not be automatically migrated.
+
 ### Remove old container
 
 1. Stop the running container
@@ -47,6 +49,10 @@ In the setup wizard, select that you already have a configuration file and uploa
 [docs-getting-started]: ../../getting-started.md
 [docs-examples]: ../../examples/tutorials/basic-installation.md
 
+### Environment Variables
+
+v15 does not use the same environment variables as v14, most of them have been moved to the Admin Panel in the Web UI.
+
 ### Done
 
 You have now successfully migrated to `v15` of `wg-easy`.