docs: remove warnings/update diagrams (#1746)

* remove warnings/udpate diagrams

* replace get_relevant_documents with invoke

docs/docs/how-tos/persistence_postgres.ipynb

@@ -81,7 +81,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 1,
    "id": "e5213193-5a7d-43e7-aeba-fe732bb1cd7a",
    "metadata": {},
    "outputs": [],
@@ -124,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 2,
    "id": "2b9d13b1-9d72-48a0-b63a-adc062c06c29",
    "metadata": {},
    "outputs": [],
@@ -134,7 +134,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 3,
    "id": "3fe36f67-073a-4fd7-a8f8-da196dd46a0d",
    "metadata": {},
    "outputs": [],
@@ -159,7 +159,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 4,
    "id": "bd235fc7-1e5c-4db6-a90b-ea75462ccf7d",
    "metadata": {},
    "outputs": [],
@@ -376,19 +376,10 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 5,
    "id": "4faf6087-73cc-4957-9a4f-f3509a32a740",
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "/Users/vadymbarda/.virtualenvs/langgraph-postgres/lib/python3.11/site-packages/psycopg_pool/pool_async.py:138: RuntimeWarning: opening the async pool AsyncConnectionPool in the constructor is deprecated and will not be supported anymore in a future release. Please use `await pool.open()`, or use the pool as context manager using: `async with AsyncConnectionPool(...) as pool: `...\n",
-      "  warnings.warn(\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "from psycopg_pool import AsyncConnectionPool\n",
     "\n",
@@ -401,7 +392,7 @@
     "    checkpointer = AsyncPostgresSaver(pool)\n",
     "\n",
     "    # NOTE: you need to call .setup() the first time you're using your checkpointer\n",
-    "    # await checkpointer.setup()\n",
+    "    await checkpointer.setup()\n",
     "\n",
     "    graph = create_react_agent(model, tools=tools, checkpointer=checkpointer)\n",
     "    config = {\"configurable\": {\"thread_id\": \"4\"}}\n",