add history

Author: Hao Yuan

src/aks-preview/HISTORY.rst

@@ -12,6 +12,10 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 
+18.0.0b44
++++++++
+* Hide `--enable-managed-system-pool` parameter for `az aks create` for now, as the feature is not ready yet.
+
 18.0.0b43
 +++++++
 * Fix `--localdns-config` parameter to handle null values and case-insensitive JSON keys in DNS override sections, preventing crashes with malformed localdns configuration files.
@@ -43,7 +47,7 @@ Pending
 * Add option `AzureLinuxOSGuard` and `AzureLinux3OSGuard` to `--os-sku` for `az aks nodepool add` and `az aks nodepool update`.
 * Add machine command `az aks machine add` to add a machine to an existing machine pool.
 * Add blue-green upgrade strategy support for AKS node pools:
-  - `az aks nodepool add/update/upgrade`: Add `--upgrade-strategy` parameter to switch between rolling and blue-green nodepool upgrades. 
+  - `az aks nodepool add/update/upgrade`: Add `--upgrade-strategy` parameter to switch between rolling and blue-green nodepool upgrades.
   - `az aks nodepool add/update/upgrade`: Add `--drain-batch-size`, `--drain-timeout-bg`, `--batch-soak-duration`, `--final-soak-duration` parameters to configure blue-green upgrade settings.
 
 18.0.0b38