Update godoc

fig.go

@@ -37,16 +37,16 @@ const (
 // A field can be marked as required by adding a `required` key in the field's struct tag.
 // If a required field is not set by the configuration file an error is returned.
 //
-//   type config struct {
-//     Env string `fig:"env,required"` // or `fig:",required"`
+//   type Config struct {
+//     Env string `fig:"env" validate:"required"` // or just `validate:"required"`
 //   }
 //
-// A field can be configured with a default value by adding a `default=value` in the field's
-// struct tag.
+// A field can be configured with a default value by adding a `default` key in the
+// field's struct tag.
 // If a field is not set by the configuration file then the default value is set.
 //
 //  type config struct {
-//    Level string `fig:"level,default=info"` // or `fig:",default=info"`
+//    Level string `fig:"level" default:"info"` // or just `default:"info"`
 //  }
 //
 // A single field may not be marked as both `required` and `default`.