Update 60-env-vars.md (#4013)

* Update 60-env-vars.md

VITE doesn't use `process.` it's `import.meta`

* docs: explain import meta env

Co-authored-by: Bjorn Lu <[email protected]>

Author: DreaminDani

documentation/faq/60-env-vars.md

@@ -2,7 +2,7 @@
 title: How do I use environment variables?
 ---
 
-Vite uses [dotenv](https://github.com/motdotla/dotenv) to load environment variables from a file named `.env` or similar. Only environment variables prefixed with `VITE_` are exposed ([you can set `envPrefix` to change this](https://vitejs.dev/config/#envprefix)). Vite will use these and statically replace them at build-time.
+Vite uses [dotenv](https://github.com/motdotla/dotenv) to load environment variables from a file named `.env` or similar. Only environment variables prefixed with `VITE_` are exposed ([you can set `envPrefix` to change this](https://vitejs.dev/config/#envprefix)). You can access the variable using `import.meta.env.VITE_ENV_VAR`, and Vite will statically replace them at build-time.
 
 To use environment variables at runtime, you would need to instantiate dotenv yourself in your server-side code so that they are exposed at `process.env.YOUR_ENV_VAR`. You may also use `$session` to pass them to the client if needed.