message: Updates command option in readme.md
diff: @@ -159,13 +159,13 @@ m365 spo site get --help
  Execute a command and output response as text.
  ```sh
  -m365 spo site get --webUrl https://contoso.sharepoint.com
  +m365 spo site get --url https://contoso.sharepoint.com
  ```
  Execute a command and output response as JSON using the global `--output` option.
  ```sh
  -m365 spo site get --webUrl https://contoso.sharepoint.com --output json
  +m365 spo site get --url https://contoso.sharepoint.com --output json
  ```
  Filter responses and return custom objects using [JMESPath](https://jmespath.org/) queries using the global `--query` option.
  