Fix incorrect API name in dashboard documentation: AddOrleansDashboard → AddDashboard (#9894)

* Initial plan

* Update AddOrleansDashboard to AddDashboard in README files

Co-authored-by: ReubenBond <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: ReubenBond <[email protected]>

Author: Copilot

playground/DashboardSeparateHost/README.md

@@ -62,7 +62,7 @@ dashboardBuilder.UseOrleansClient(clientBuilder =>
         options.Gateways.Add(new IPEndPoint(IPAddress.Loopback, 30000).ToGatewayUri()));
 
     // Add dashboard services
-    clientBuilder.AddOrleansDashboard();
+    clientBuilder.AddDashboard();
 });
 
 var app = dashboardBuilder.Build();
@@ -105,7 +105,7 @@ dashboardBuilder.UseOrleansClient(clientBuilder =>
         options.Gateways.Add(new IPEndPoint(IPAddress.Parse("10.0.0.2"), 30000).ToGatewayUri());
     });
 
-    clientBuilder.AddOrleansDashboard();
+    clientBuilder.AddDashboard();
 });
 ```
 

src/Dashboard/Orleans.Dashboard/README.md

@@ -63,7 +63,7 @@ builder.UseOrleansClient(clientBuilder =>
         options.Gateways.Add(new IPEndPoint(IPAddress.Loopback, 30000).ToGatewayUri()));
 
     // Add dashboard services
-    clientBuilder.AddOrleansDashboard();
+    clientBuilder.AddDashboard();
 });
 
 var app = builder.Build();