Update windows_winrm.rst (#73101)

The standard Port for ansible winrm is set to 5986/HTTPS. 
To be able to use Kerberos, you need to set ansible_port: 5985/HTTP otherwiese you get error message or timeout.
HTTPS is not needed for environments with Kerberos, since kerberos has server identification built in to the protocoll.
FYI: HTTP traffic will by default also be encrypted when using kerberos

docs/docsite/rst/user_guide/windows_winrm.rst

@@ -281,6 +281,7 @@ The following example shows host vars configured for Kerberos authentication:
     ansible_user: username@MY.DOMAIN.COM
     ansible_password: Password
     ansible_connection: winrm
+    ansible_port: 5985
     ansible_winrm_transport: kerberos
 
 As of Ansible version 2.3, the Kerberos ticket will be created based on