Update examples.md for more realism (#332)

## Summary
- Updates all server.json examples to use `io.github` namespace instead
of `com.github`
- Fixes validator test case to use proper domain format
- Aligns with standard reverse domain name convention for GitHub-hosted
projects

This change improves consistency across documentation examples and
follows established naming conventions.

internal/validators/validators_test.go

@@ -395,7 +395,7 @@ func TestValidate_ServerNameFormat(t *testing.T) {
 		{
 			name: "valid complex namespace",
 			serverDetail: apiv0.ServerJSON{
-				Name: "com.github.microsoft.azure/webapp-server",
+				Name: "com.microsoft.azure.service/webapp-server",
 			},
 			expectError: false,
 		},