Explanation
From the output we see DSW2 is running in RSTP mode (in fact Rapid PVST+ mode as Cisco does not support RSTP alone). When a new switch running PVST+ mode is added to the topology, they keep running the old STP instances as RSTP (in fact Rapid PVST+) is compatible with PVST+.

Explanation
"The next step is to configure the WLC for the Internal web authentication. Internal web authentication is the defaultweb authentication type on WLCs." In step 4 of the link above, we will configure Security as described in this question. Therefore we can deduce thisconfiguration is for Internal web authentication.
This paragraph was taken from the link
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wlan-security/69340-web-auth-config.html#c5 :

Explanation

Explanation
When you click Deploy, Cisco DNA Center requests the Cisco Identity Services Engine (Cisco ISE) to send notifications about the policy changes to the network devices.