Vwp/docs improved document loaders (#4006)

Huge thanks to @leo-gan for improving the document loaders notebooks

---------

Co-authored-by: Leonid Ganeline <leo.gan.57@gmail.com>

docs/modules/indexes/document_loaders/examples/bilibili.ipynb

@@ -7,29 +7,33 @@
    "source": [
     "# Bilibili\n",
     "\n",
-    "This loader utilizes the `bilibili-api` to fetch the text transcript from Bilibili, one of the most beloved long-form video sites in China.\n",
+    "This loader utilizes the [bilibili-api](https://github.com/MoyuScript/bilibili-api) to fetch the text transcript from [Bilibili](https://www.bilibili.tv/), one of the most beloved long-form video sites in China.\n",
     "\n",
     "With this BiliBiliLoader, users can easily obtain the transcript of their desired video content on the platform."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
-   "id": "9ec8a3b3",
-   "metadata": {},
+   "execution_count": null,
+   "id": "43128d8d",
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
-    "from langchain.document_loaders.bilibili import BiliBiliLoader"
+    "#!pip install bilibili-api"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
-   "id": "43128d8d",
-   "metadata": {},
+   "execution_count": null,
+   "id": "9ec8a3b3",
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
-    "#!pip install bilibili-api"
+    "from langchain.document_loaders.bilibili import BiliBiliLoader"
    ]
   },
   {
@@ -51,16 +55,20 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "outputs": [],
-   "source": [
-    "loader.load()"
-   ],
+   "id": "3470dadf",
    "metadata": {
     "collapsed": false,
+    "jupyter": {
+     "outputs_hidden": false
+    },
     "pycharm": {
      "name": "#%%\n"
     }
-   }
+   },
+   "outputs": [],
+   "source": [
+    "loader.load()"
+   ]
   }
  ],
  "metadata": {
@@ -79,9 +87,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.9"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
+}