update help info

Author: FumingZhang

src/aks-preview/azext_aks_preview/_help.py

@@ -3868,7 +3868,7 @@
 helps['aks bastion'] = """
     type: command
     short-summary: Connect to a managed Kubernetes cluster using Azure Bastion.
-    long-summary: The command would launch a subshell with the kubeconfig set to connect to the cluster via Bastion. Use exit or Ctrl-D (i.e. EOF) to exit the subshell.
+    long-summary: The command will launch a subshell with the kubeconfig set to connect to the cluster via Bastion. Use exit or Ctrl-D (i.e. EOF) to exit the subshell.
     parameters:
         - name: --bastion
           type: string