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/srt.ipynb

@@ -6,14 +6,33 @@
    "metadata": {},
    "source": [
     "# Subtitle Files\n",
-    "How to load data from subtitle (`.srt`) files"
+    "\n",
+    ">[The SubRip file format](https://en.wikipedia.org/wiki/SubRip#SubRip_file_format) is described on the `Matroska` multimedia container format website as \"perhaps the most basic of all subtitle formats.\" `SubRip (SubRip Text)` files are named with the extension `.srt`, and contain formatted lines of plain text in groups separated by a blank line. Subtitles are numbered sequentially, starting at 1. The timecode format used is hours:minutes:seconds,milliseconds with time units fixed to two zero-padded digits and fractions fixed to three zero-padded digits (00:00:00,000). The fractional separator used is the comma, since the program was written in France.\n",
+    "\n",
+    "How to load data from subtitle (`.srt`) files\n",
+    "\n",
+    "Please, download the [example .srt file from here](https://www.opensubtitles.org/en/subtitles/5575150/star-wars-the-clone-wars-crisis-at-the-heart-en)."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
+   "execution_count": null,
+   "id": "c6eb0372-ad36-4747-8120-d1557fe632fd",
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "!pip install pysrt"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
    "id": "2cbb7f5c",
-   "metadata": {},
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
     "from langchain.document_loaders import SRTLoader"
@@ -21,9 +40,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 5,
    "id": "865d8a14",
-   "metadata": {},
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
     "loader = SRTLoader(\"example_data/Star_Wars_The_Clone_Wars_S06E07_Crisis_at_the_Heart.srt\")"
@@ -31,9 +52,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": null,
    "id": "173a9234",
-   "metadata": {},
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
    "source": [
     "docs = loader.load()"
@@ -59,14 +82,6 @@
    "source": [
     "docs[0].page_content[:100]"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "3b7a8dc4",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -85,7 +100,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.1"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,