Update health checks docs for core 3.1 (#5772)
Update health checks docs for core 3.1 (#5772)

Version agnostic link, will redirect to the latest (?view=aspnetcore-3.1)
xkproject/Orchard2,stevetayloruk/Orchard2,petedavis/Orchard2,stevetayloruk/Orchard2,petedavis/Orchard2,xkproject/Orchard2,xkproject/Orchard2,OrchardCMS/Brochard,petedavis/Orchard2,stevetayloruk/Orchard2,stevetayloruk/Orchard2,OrchardCMS/Brochard,xkproject/Orchard2,petedavis/Orchard2,OrchardCMS/Brochard,stevetayloruk/Orchard2,xkproject/Orchard2