update IGWN alert authentication doc
document the change from getting the igwn-alert credentials from auth.toml
instead of netrc.
Maintenance will be performed on git.ligo.org, containers.ligo.org, and docs.ligo.org on Tuesday 30 April 2024 starting at approximately 9am PDT. It is expected to take around twenty minutes and there will be several periods of downtime throughout the maintenance. Please address any comments, concerns, or questions to the helpdesk.
document the change from getting the igwn-alert credentials from auth.toml
instead of netrc.