docs: add missing docs for some enums (#114)

completion.go

@@ -396,6 +396,11 @@ func (r CompletionNewParams) MarshalJSON() (data []byte, err error) {
 	return apijson.MarshalRoot(r)
 }
 
+// ID of the model to use. You can use the
+// [List models](https://platform.openai.com/docs/api-reference/models/list) API to
+// see all of your available models, or see our
+// [Model overview](https://platform.openai.com/docs/models) for descriptions of
+// them.
 type CompletionNewParamsModel string
 
 const (

finetuningjob.go

@@ -549,6 +549,8 @@ func (r FineTuningJobNewParams) MarshalJSON() (data []byte, err error) {
 	return apijson.MarshalRoot(r)
 }
 
+// The name of the model to fine-tune. You can select one of the
+// [supported models](https://platform.openai.com/docs/guides/fine-tuning#which-models-can-be-fine-tuned).
 type FineTuningJobNewParamsModel string
 
 const (