Removed all references to #feed_alerts-general.
In https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16818#note_1167874826 we discussed that no one is using #feeds_alerts-general, so I'm removing all references to it from the runbooks.
In https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16818#note_1167874826 we discussed that no one is using #feeds_alerts-general, so I'm removing all references to it from the runbooks.