Update src/content/partials/workers/secrets-in-dev.mdx

Author: vicb

src/content/partials/workers/secrets-in-dev.mdx

@@ -12,6 +12,6 @@ SECRET_KEY="value"
 API_TOKEN="eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9"
 ```
 
-You can set secrets per environment by creating additional files with the naming convention `.dev.vars.<environment-name>`. When you set the environment using `wrangler <command> --env <environment-name>`, these files take precedence over `.dev.vars`.
+You can set secrets per environment by creating additional files with the naming convention `.dev.vars.<environment-name>`. When you set the environment using `wrangler <command> --env <environment-name>`, such an environment specific file will be loaded instead of the `.dev.vars` file - they are not merged.
 
 Like other environment variables, secrets are [non-inheritable](/workers/wrangler/configuration/#non-inheritable-keys) and must be defined per environment.