docs(api): Add additional usage to --env webpack CLI docs

Author: grisanu

src/content/api/cli.md

@@ -130,16 +130,17 @@ webpack --env.platform=web  # sets env.platform == "web"
 
 The `--env` argument accepts various syntaxes:
 
-| Invocation                    | Resulting environment       |
-|-------------------------------|-----------------------------|
-| webpack --env prod            | `"prod"`                    |
-| webpack --env.prod            | `{ prod: true }`            |
-| webpack --env.prod=1          | `{ prod: 1 }`               |
-| webpack --env.prod=foo        | `{ prod: "foo" }`           |
-| webpack --env.prod --env.min  | `{ prod: true, min: true }` |
-| webpack --env.prod --env min  | `[{ prod: true }, "min"]`   |
-
-T> See this [environment variables](/guides/environment-variables) guide for more information.
+| Invocation                             | Resulting environment       |
+|----------------------------------------|-----------------------------|
+| webpack --env prod                     | `"prod"`                    |
+| webpack --env.prod                     | `{ prod: true }`            |
+| webpack --env.prod=1                   | `{ prod: 1 }`               |
+| webpack --env.prod=foo                 | `{ prod: "foo" }`           |
+| webpack --env.prod --env.min           | `{ prod: true, min: true }` |
+| webpack --env.prod --env min           | `[{ prod: true }, "min"]`   |
+| webpack --env.prod=foo --env.prod=bar  | `{prod: [ "foo", "bar" ]}`  |
+
+T> See this [environment variables](/guides/environment-variables) guide for more information on its usage.
 
 ### Output Options