docs: Specify environment variables for BedrockConverse (#32194)

docs/docs/integrations/chat/bedrock.ipynb

@@ -51,7 +51,31 @@
     "\n",
     "### Credentials\n",
     "\n",
-    "Head to the [AWS docs](https://docs.aws.amazon.com/bedrock/latest/userguide/setting-up.html) to sign up to AWS and setup your credentials. You'll also need to turn on model access for your account, which you can do by following [these instructions](https://docs.aws.amazon.com/bedrock/latest/userguide/model-access.html)."
+    "Head to the [AWS docs](https://docs.aws.amazon.com/bedrock/latest/userguide/setting-up.html) to sign up to AWS and setup your credentials.\n",
+    "\n",
+    "Alternatively, `ChatBedrockConverse` will read from the following environment variables by default:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0f65be92",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# os.environ[\"AWS_ACCESS_KEY_ID\"] = \"...\"\n",
+    "# os.environ[\"AWS_SECRET_ACCESS_KEY\"] = \"...\"\n",
+    "\n",
+    "# Not required unless using temporary credentials.\n",
+    "# os.environ[\"AWS_SESSION_TOKEN\"] = \"...\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "3baad5a9",
+   "metadata": {},
+   "source": [
+    "You'll also need to turn on model access for your account, which you can do by following [these instructions](https://docs.aws.amazon.com/bedrock/latest/userguide/model-access.html)."
    ]
   },
   {
@@ -114,6 +138,10 @@
     "\n",
     "llm = ChatBedrockConverse(\n",
     "    model_id=\"anthropic.claude-3-5-sonnet-20240620-v1:0\",\n",
+    "    # region_name=...,\n",
+    "    # aws_access_key_id=...,\n",
+    "    # aws_secret_access_key=...,\n",
+    "    # aws_session_token=...,\n",
     "    # temperature=...,\n",
     "    # max_tokens=...,\n",
     "    # other params...\n",