docs: Update async_chromium.ipynb (#19514)

In Jupyter, asyncio would throw an error before `.load()` unless
`nest_asyncio` is applied (Issue #8494 mentioned this)

+Minor typo fixes..

docs/docs/integrations/document_loaders/async_chromium.ipynb

@@ -13,7 +13,7 @@
     "\n",
     "Headless mode means that the browser is running without a graphical user interface.\n",
     "\n",
-    "`AsyncChromiumLoader` load the page, and then we use `Html2TextTransformer` to trasnform to text."
+    "`AsyncChromiumLoader` loads the page, and then we use `Html2TextTransformer` to transform to text."
    ]
   },
   {
@@ -24,7 +24,7 @@
    "outputs": [],
    "source": [
     "%pip install --upgrade --quiet  playwright beautifulsoup4\n",
-    "! playwright install"
+    "!playwright install"
    ]
   },
   {
@@ -53,6 +53,27 @@
     "docs[0].page_content[0:100]"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "c64e7df9",
+   "metadata": {},
+   "source": [
+    "If you are using Jupyter notebooks, you might need to apply `nest_asyncio` before loading the documents."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5f2fe3c0",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "!pip install nest-asyncio\n",
+    "import nest_asyncio\n",
+    "\n",
+    "nest_asyncio.apply()"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 6,