update export command docs with proejctId flag

docs/cli/commands/export.mdx

@@ -16,7 +16,7 @@ Export environment variables from the platform into a file format.
 | Option        | Description                                                                                                                                                                                                                   | Default value |
 | ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------- |
 | `--env`       | Used to set the environment that secrets are pulled from. Accepted values: `dev`, `staging`, `test`, `prod`                                                                                                                   | `dev`         |
-| `--projectId` | Only required if injecting via the [service token method](../token). If you are not using service token, the project id will be automatically retrieved from the `.infisical.json` located at the root of your local project. | `None`        |
+| `--projectId` | By default the project id isretrieved from the `.infisical.json` located at the root of your local project. This flag allows you to override this behavior | `None`        |
 | `--expand`    | Parse shell parameter expansions in your secrets (e.g., `${DOMAIN}`)                                                                                                                                                          | `true`        |
 | `--format`    | Format of the output file. Accepted values: `dotenv`, `dotenv-export`, `csv` and `json`                                                                                                                                       | `dotenv`      |