Update secrets-in-dev.mdx

Author: emily-shen

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

@@ -1,6 +1,5 @@
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 {}
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 When developing your Worker or Pages Function, create a `.dev.vars` file in the root of your project to define secrets that will be used when running `wrangler dev` or `wrangler pages dev`, as opposed to using [environment variables in `wrangler.toml`](/workers/configuration/environment-variables/#compare-secrets-and-environment-variables). This works both in local and remote development modes.
@@ -11,3 +10,5 @@ The `.dev.vars` file should be formatted like a `dotenv` file, such as `KEY="VAL
 SECRET_KEY="value"
 API_TOKEN="eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9"
 ```
+
+You can set secrets per environment by creating additional files with the naming convention `.dev.vars.<environment-name>`. Like other environment variables, secrets are [non-inheritable](/workers/wrangler/configuration/#non-inheritable-keys) and must be defined per environment.