doc(machinepool): accept wording change

- changed the wording as willie-yao suggested in PR

Co-authored-by: Willie Yao <[email protected]>

docs/book/src/developers/development.md

@@ -571,7 +571,7 @@ You can optionally set the following variables:
 | `KUBERNETES_VERSION`        | Desired Kubernetes version to test. You can pass in a definitive released version, e.g., "v1.24.0". If you want to use pre-released CI bits of a particular release you may use the "latest-" prefix, e.g., "latest-1.24"; you may use the very latest built CI bits from the kubernetes/kubernetes master branch by passing in "latest". If you provide a `KUBERNETES_VERSION` environment variable, you may not also use `CI_VERSION` (below). Use only one configuration variable to declare the version of Kubernetes to test. |
 | `CI_VERSION`                | Provide a custom CI version of Kubernetes (e.g., `v1.25.0-alpha.0.597+aa49dffc7f24dc`). If not specified, this will be determined from the KUBERNETES_VERSION above if it is an unreleased version. If you provide a `CI_VERSION` environment variable, you may not also use `KUBERNETES_VERSION` (above).                                                                                                                                                                                                                         |
 | `TEST_CCM`                  | Build a cluster that uses custom versions of the Azure cloud-provider cloud-controller-manager and node-controller-manager images                                                                                                                                                                                                                                                                                                                                                                                                  |
-| `EXP_MACHINE_POOL`          | Use [Machine Pool](../self-managed/machinepools.md) for worker machines. Set this to false if you don’t want to enable the Machine Pool, as it defaults to true.                                                                                                                                                                                                                                                                                                                                                                   |
+| `EXP_MACHINE_POOL`          | Use [Machine Pool](../self-managed/machinepools.md) for worker machines. Defaults to true.                                                                                                                                                                                                                                                                                                                                                                   |
 | `TEST_WINDOWS`              | Build a cluster that has Windows worker nodes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
 | `REGISTRY`                  | Registry to push any custom k8s images or cloud provider images built.                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
 | `CLUSTER_TEMPLATE`          | Use a custom cluster template. It can be a path to a template under templates/, a path on the host or a link. If the value is not set, the script will choose the appropriate cluster template based on existing environment variables.                                                                                                                                                                                                                                                                                            |