docs: Fix broken 'Dex Connectors' link (#4647)
docs: Fix broken 'Dex Connectors' link (#4647)

The documentation of Dex was materialized to https://dexidp.io/docs/ in the meantime.
argoproj/argo-cd,argoproj/argo-cd,argoproj/argo-cd,argoproj/argo-cd,argoproj/argo-cd