{ACR} az acr show-usage: Add examples for MaximumStorageCapacity and Size query (#32263)

Author: brethompson309

src/azure-cli/azure/cli/command_modules/acr/_help.py

@@ -898,6 +898,12 @@
   - name: Get the storage usage for an Azure Container Registry.
     text: >
         az acr show-usage -n myregistry
+  - name: Get the current amount of storage used by the registry based on the included storage of its SKU (in bytes).
+    text: >
+        az acr show-usage -n myregistry --query "value[?name=='Size'] | [0]"
+  - name: Get the current amount of storage used by the registry and the maximum storage capacity allowed.
+    text: >
+        az acr show-usage -n myregistry --query "value[?name=='MaximumStorageCapacity'] | [0]"
 """
 
 helps['acr task'] = """