add variable and method comments

internal/metal/providers/emapi/config.go

@@ -17,6 +17,7 @@ type Config struct {
 	ConsumerToken string
 }
 
+// Populated checks if any field has been populated.
 func (c Config) Populated() bool {
 	return c.AuthToken != "" || c.ConsumerToken != "" || c.BaseURL != ""
 }