Remove `oc patch` command for webapp in installation document

[honghuac]

oc patch command already perfomed in ansible playbook - https://github.com/RedHatWorkshops/dayinthelife-integration/blob/8abf5e8b16422c1b70cdf09a8369ce603e5bfa96/support/install/ansible/playbooks/openshift/roles/setup_webapp/tasks/main.yml#L29