Bastion linux native client should refer to bastion cli extension

'az network bastion' commands require 'bastion' extension to be installed. Current docs refer to ssh instead.

Author: yanrez

articles/bastion/connect-vm-native-client-linux.md

@@ -34,7 +34,7 @@ Verify that the following roles and ports are configured in order to connect to
 
 ## <a name="ssh"></a>Connect to a Linux VM
 
-The steps in the following sections help you connect to a Linux VM from a Linux native client using the **az network bastion** command.  This extension can be installed by running, `az extension add --name ssh`.
+The steps in the following sections help you connect to a Linux VM from a Linux native client using the **az network bastion** command.  This extension can be installed by running, `az extension add --name bastion`.
 
 When you connect using this command, file transfers aren't supported. If you want to upload files, connect using the [az network bastion tunnel](#tunnel) command instead.