update alt text

Author: tfitzmac

articles/azure-resource-manager/management/request-limits-and-throttling.md

@@ -13,7 +13,7 @@ Throttling happens at two levels. Azure Resource Manager throttles requests for
 
 The following image shows how throttling is applied as a request goes from the user to Azure Resource Manager and the resource provider. The image shows that requests are initially throttled per principal ID and per Azure Resource Manager instance in the region of the user sending the request. The requests are throttled per hour. When the request is forwarded to the resource provider, requests are throttled per region of the resource rather than per Azure Resource Manager instance in region of the user. The resource provider requests are also throttled per principal user ID and per hour.
 
-![Request throttling](./media/request-limits-and-throttling/request-throttling.svg)
+:::image type="content" source="./media/request-limits-and-throttling/request-throttling.svg" alt-text="Diagram that shows how throttling is applied as a request goes from the user to Azure Resource Manager and the resource provider.":::
 
 ## Subscription and tenant limits
 

articles/azure-resource-manager/management/resource-providers-and-types.md

@@ -80,23 +80,23 @@ To see information for a particular resource provider:
 2. On the Azure portal menu, select **All services**.
 3. In the **All services** box, enter **resource explorer**, and then select **Resource Explorer**.
 
-    ![select All services](./media/resource-providers-and-types/select-resource-explorer.png)
+    :::image type="content" source="./media/resource-providers-and-types/select-resource-explorer.png" alt-text="Screenshot of selecting All services in the Azure portal.":::
 
 4. Expand **Providers** by selecting the right arrow.
 
-    ![Select providers](./media/resource-providers-and-types/select-providers.png)
+    :::image type="content" source="./media/resource-providers-and-types/select-providers.png" alt-text="Screenshot of selecting providers in the Azure Resource Explorer.":::
 
 5. Expand a resource provider and resource type that you want to view.
 
-    ![Select resource type](./media/resource-providers-and-types/select-resource-type.png)
+    :::image type="content" source="./media/resource-providers-and-types/select-resource-type.png" alt-text="Screenshot of selecting a resource type in the Azure Resource Explorer.":::
 
 6. Resource Manager is supported in all regions, but the resources you deploy might not be supported in all regions. Also, there may be limitations on your subscription that prevent you from using some regions that support the resource. The resource explorer displays valid locations for the resource type.
 
-    ![Show locations](./media/resource-providers-and-types/show-locations.png)
+    :::image type="content" source="./media/resource-providers-and-types/show-locations.png" alt-text="Screenshot of showing locations for a resource type in the Azure Resource Explorer.":::
 
 7. The API version corresponds to a version of REST API operations that are released by the resource provider. As a resource provider enables new features, it releases a new version of the REST API. The resource explorer displays valid API versions for the resource type.
 
-    ![Show API versions](./media/resource-providers-and-types/show-api-versions.png)
+    :::image type="content" source="./media/resource-providers-and-types/show-api-versions.png" alt-text="Screenshot of showing API versions for a resource type in the Azure Resource Explorer.":::
 
 ## Azure PowerShell