Merge pull request #123434 from hyoshioka0128/patch-815

Update create-portal-availability-zone.md (Typo "a  Azure"→"an Azure")

Author: ShannonLeavitt

articles/virtual-machines/create-portal-availability-zone.md

@@ -34,7 +34,7 @@ To use availability zones, create your virtual machines in a [supported Azure re
 
 1. Complete the rest of the page as usual. If you want to create a load balancer, go to the **Networking** tab > **Load Balancing** > **Load balancing options**. You can choose either an Azure load balancer or an Application gateway.
 
-   For a **Azure load balancer**:
+   For an **Azure load balancer**:
 
    1. You can select an existing load balancer or select **Create a load balancer**.
    2. To create a new load balancer, for **Load balancer name** type a load balancer name.