[docs]: add auth and small changes (#1356)

* wip

* m

* nit

docs/docs/cloud/how-tos/stream_multiple.md

@@ -9,7 +9,7 @@ First let's set up our client and thread:
     ```python
     from langgraph_sdk import get_client
 
-    client = get_client(url="<DEPLOYMENT_URL>")
+    client = get_client(url=<DEPLOYMENT_URL>)
     # create thread
     thread = await client.threads.create()
     print(thread)
@@ -20,7 +20,7 @@ First let's set up our client and thread:
     ```js
     import { Client } from "@langchain/langgraph-sdk";
 
-    const client = new Client({ apiUrl:"<DEPLOYMENT_URL>" });
+    const client = new Client({ apiUrl: <DEPLOYMENT_URL> });
     // create thread
     const thread = await client.threads.create();
     console.log(thread)
@@ -31,10 +31,7 @@ First let's set up our client and thread:
     ```bash
     curl --request POST \
       --url <DEPLOYMENT_URL>/threads \
-      --header 'Content-Type: application/json' \
-      --data '{
-        "metadata": {}
-      }'
+      --header 'Content-Type: application/json'
     ```
 
 Output: