Add enum flag to 7.x docs (#1487)

Author: drwpow

docs/cli.md

@@ -81,23 +81,26 @@ resolve:
 
 Refer to the [Redocly docs](https://redocly.com/docs/cli/configuration/#resolve-non-public-or-non-remote-urls) for additional options.
 
-## Options
+## Flags
 
-| Option                    | Alias | Default  | Description                                                                                                         |
+The following flags are supported in the CLI:
+
+| Flag                      | Alias | Default  | Description                                                                                                         |
 | :------------------------ | :---- | :------: | :------------------------------------------------------------------------------------------------------------------ |
 | `--help`                  |       |          | Display inline help message and exit                                                                                |
 | `--version`               |       |          | Display this library’s version and exit                                                                             |
 | `--output [location]`     | `-o`  | (stdout) | Where should the output file be saved?                                                                              |
 | `--redoc [location]`      |       |          | Path to a `redocly.yaml` file (see [Multiple schemas](#multiple-schemas))                                           |
-| `--immutable`             |       | `false`  | Generates immutable types (readonly properties and readonly array)                                                  |
 | `--additional-properties` |       | `false`  | Allow arbitrary properties for all schema objects without `additionalProperties: false`                             |
-| `--empty-objects-unknown` |       | `false`  | Allow arbitrary properties for schema objects with no specified properties, and no specified `additionalProperties` |
+| `--alphabetize`           |       | `false`  | Sort types alphabetically                                                                                           |
+| `--array-length`          |       | `false`  | Generate tuples using array `minItems` / `maxItems`                                                                 |
 | `--default-non-nullable`  |       | `false`  | Treat schema objects with default values as non-nullable                                                            |
+| `--empty-objects-unknown` |       | `false`  | Allow arbitrary properties for schema objects with no specified properties, and no specified `additionalProperties` |
+| `--enum`                  |       | `false`  | Generate true [TS enums](https://www.typescriptlang.org/docs/handbook/enums.html) rather than string unions.        |
+| `--exclude-deprecated`    |       | `false`  | Exclude deprecated fields from types                                                                                |
 | `--export-type`           | `-t`  | `false`  | Export `type` instead of `interface`                                                                                |
+| `--immutable`             |       | `false`  | Generates immutable types (readonly properties and readonly array)                                                  |
 | `--path-params-as-types`  |       | `false`  | Allow dynamic string lookups on the `paths` object                                                                  |
-| `--array-length`          |       | `false`  | Generate tuples using array `minItems` / `maxItems`                                                                 |
-| `--alphabetize`           |       | `false`  | Sort types alphabetically                                                                                           |
-| `--exclude-deprecated`    |       | `false`  | Exclude deprecated fields from types                                                                                |
 
 ### pathParamsAsTypes