fix link description (google#449)

Author: MarkDaoust

site/en/gemini-api/docs/semantic_retrieval.ipynb

@@ -129,7 +129,7 @@
         "Follow the steps below to setup OAuth using service accounts:\n",
         "\n",
         "\n",
-        "1. Enable the [Gemini API](https://console.cloud.google.com/flows/enableapi?apiid=generativelanguage.googleapis.com){:.external}.\n",
+        "1. Enable the [Gemini API (Generative Language API)](https://console.cloud.google.com/flows/enableapi?apiid=generativelanguage.googleapis.com){:.external}.\n",
         "\n",
         "<img width=400 src=\"https://ai.google.dev/tutorials/images/semantic_retriever_enable_api.png\">\n",
         "\n",