docs: update doc comments with current Mistral API links

- Update crate-level docs with full API coverage description
- Fix stale docs.mistral.ai URLs to current endpoint references
- Point ChatMessageRole to chat completions API docs
- Point ModelListData to models API docs

src/v1/chat.rs

@@ -60,7 +60,7 @@ impl ChatMessage {
     }
 }
 
-/// See the [Mistral AI API documentation](https://docs.mistral.ai/capabilities/completion/#chat-messages) for more information.
+/// See the [chat completions API](https://docs.mistral.ai/api/#tag/chat/operation/chat_completion_v1_chat_completions_post).
 #[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
 pub enum ChatMessageRole {
     #[serde(rename = "system")]

src/v1/model_list.rs

@@ -9,7 +9,7 @@ pub struct ModelListResponse {
     pub data: Vec<ModelListData>,
 }
 
-/// See: https://docs.mistral.ai/api/#tag/models
+/// See the [models API](https://docs.mistral.ai/api/#tag/models/operation/list_models_v1_models_get).
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct ModelListData {
     pub id: String,