docs: aks-engine deploy tutorial errors out for auth method as CLI for linux container on windows

[munishm]

If you try to run as per the documentation inside the container, it errors out because of auth-method as CLI when running it inside the linux container on windows.

Two probable solutions:
Either don't set the authentication method here
Or set the auth-method to client-secret

Reason for Change:
Fixes the tutorial documentation for the case if running it inside the linux container on windows

Issue Fixed:

#1108 & #773 partially

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

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[CecileRobertMichon]

lgtm

thanks @munishm !

[jackfrancis]

/lgtm

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