Allows different models for text-embedding

examples/text-embedding.rs

@@ -33,7 +33,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         ],
     };
 
-    let result = gemini.text_embeddings(&embedding_request).await?;
+    let result = gemini
+        .text_embeddings(&embedding_request, "textembedding-gecko@003")
+        .await?;
     println!("Response: {:?}", result);
 
     Ok(())