doc: Fix aks approuting short-summary typo

Author: Erhard Muresan

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

@@ -2356,7 +2356,7 @@
 
 helps['aks approuting'] = """
     type: group
-    short-summary: Commands to manage App Routing aadon.
+    short-summary: Commands to manage App Routing addon.
     long-summary: A group of commands to manage App Routing in given cluster.
 """