Capitalize the handler name in handler invocations

docs/maintenance.md

roles/acme_dns_challenge/tasks/main.yml

roles/alertmanager/tasks/main.yml

roles/arch_boxes_sync/tasks/main.yml

roles/archbuild/tasks/main.yml

roles/archive_web/tasks/main.yml

roles/archmanweb/tasks/main.yml

roles/archweb/tasks/main.yml

roles/archwiki/tasks/main.yml

roles/aurweb/tasks/main.yml

roles/common/tasks/main.yml

roles/dbscripts/tasks/main.yml

roles/debuginfod/tasks/main.yml

roles/dovecot/tasks/main.yml

roles/fail2ban/tasks/main.yml

roles/fetchmail/tasks/main.yml

roles/firewalld/tasks/main.yml

roles/fluxbb/tasks/main.yml

roles/flyspray/tasks/main.yml

roles/geo_dns/tasks/main.yml