Update app.py

[happy-jo]

Line 23 - Added context to statement Line 109 - Added prefix (PrismaAccess_) and Capitalized returned log type

Documentation needs to be updated to show how to add web app configuration settings (between step 3 and 5). This is not outlined and causes the app to fail to run (crash). https://docs.paloaltonetworks.com/prisma-access/integration/microsoft-integrations-with-prisma-access/set-up-https-log-forwarding-to-microsoft-sentinel

[welcome-to-palo-alto-networks[bot]]

:tada: Thanks for opening this pull request! We really appreciate contributors like you! :raised_hands: