Apply suggestions from code review

Co-authored-by: FumingZhang <81607949+FumingZhang@users.noreply.github.com>

Author: FumingZhang

src/aks-preview/HISTORY.rst

@@ -25,12 +25,6 @@ Pending
 * `az aks machine add`: Add `--enable-ultra-ssd` flag support to enable ultra ssd on a machine.
 * `az aks update`: Fix V2-only NAT gateway params (e.g. `--nat-gateway-managed-outbound-ipv6-count`) being rejected on update when `--outbound-type` is not re-specified for an already-V2 cluster.
 
-
-20.0.0b2
-+++++++
-* `az aks create/update`: Fix DCR not being created or updated when `--enable-container-network-logs`, `--enable-retina-flow-logs`, or `--enable-high-log-scale-mode` flags are used, ensuring the Data Collection Rule streams (e.g. `Microsoft-ContainerLogV2-HighScale`) are kept in sync.
-* `az aks update`: Add validation for `--enable-high-log-scale-mode` on the update path requiring the monitoring addon with MSI authentication to be enabled.
-
 20.0.0b1
 +++++++
 * [Breaking Change] `az aks create/update`: Change `--nat-gateway-outbound-ips` and `--nat-gateway-outbound-ip-prefixes` to use comma-separated values, consistent with load balancer outbound IP parameters.