docs: added missed document_loaders examples (#5150)

# DOCS added missed document_loader examples

Added missed examples: `JSON`, `Open Document Format (ODT)`,
`Wikipedia`, `tomarkdown`.
Updated them to a consistent format.

## Who can review?

@hwchase17 
@dev2049

docs/modules/indexes/document_loaders.rst

@@ -40,10 +40,11 @@ For detailed instructions on how to get set up with Unstructured, see installati
    ./document_loaders/examples/file_directory.ipynb
    ./document_loaders/examples/html.ipynb
    ./document_loaders/examples/image.ipynb
-   ./document_loaders/examples/jupyter_notebook.ipynb
+   ./document_loaders/examples/json.ipynb
    ./document_loaders/examples/markdown.ipynb
    ./document_loaders/examples/microsoft_powerpoint.ipynb
    ./document_loaders/examples/microsoft_word.ipynb
+   ./document_loaders/examples/odt.ipynb
    ./document_loaders/examples/pandas_dataframe.ipynb
    ./document_loaders/examples/pdf.ipynb
    ./document_loaders/examples/sitemap.ipynb
@@ -81,6 +82,7 @@ We don't need any access permissions to these datasets and services.
    ./document_loaders/examples/ifixit.ipynb
    ./document_loaders/examples/imsdb.ipynb
    ./document_loaders/examples/mediawikidump.ipynb
+   ./document_loaders/examples/wikipedia.ipynb
    ./document_loaders/examples/youtube_transcript.ipynb
 
 
@@ -131,4 +133,5 @@ We need access tokens and sometime other parameters to get access to these datas
    ./document_loaders/examples/slack.ipynb
    ./document_loaders/examples/spreedly.ipynb
    ./document_loaders/examples/stripe.ipynb
+   ./document_loaders/examples/tomarkdown.ipynb
    ./document_loaders/examples/twitter.ipynb

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

@@ -4,28 +4,30 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# JSON Files\n",
+    "# JSON\n",
     "\n",
-    "The `JSONLoader` uses a specified [jq schema](https://en.wikipedia.org/wiki/Jq_(programming_language)) to parse the JSON files.\n",
-    "\n",
-    "This notebook shows how to use the `JSONLoader` to load [JSON](https://en.wikipedia.org/wiki/JSON) files into documents. A few examples of `jq` schema extracting different parts of a JSON file are also shown.\n",
+    ">[JSON (JavaScript Object Notation)](https://en.wikipedia.org/wiki/JSON) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and arrays (or other serializable values).\n",
     "\n",
+    ">The `JSONLoader` uses a specified [jq schema](https://en.wikipedia.org/wiki/Jq_(programming_language)) to parse the JSON files. It uses the `jq` python package.\n",
     "Check this [manual](https://stedolan.github.io/jq/manual/#Basicfilters) for a detailed documentation of the `jq` syntax."
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install jq"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": 1,
    "metadata": {
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "#!pip install jq"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": true,
     "jupyter": {
      "outputs_hidden": true
     }
@@ -359,7 +361,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.16"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,

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

@@ -5,9 +5,13 @@
    "id": "22a849cc",
    "metadata": {},
    "source": [
-    "## Unstructured ODT Loader\n",
+    "# Open Document Format (ODT)\n",
     "\n",
-    "The `UnstructuredODTLoader` can be used to load Open Office ODT files."
+    ">The [Open Document Format for Office Applications (ODF)](https://en.wikipedia.org/wiki/OpenDocument), also known as `OpenDocument`, is an open file format for word processing documents, spreadsheets, presentations and graphics and using ZIP-compressed XML files. It was developed with the aim of providing an open, XML-based file format specification for office applications.\n",
+    "\n",
+    ">The standard is developed and maintained by a technical committee in the Organization for the Advancement of Structured Information Standards (`OASIS`) consortium. It was based on the Sun Microsystems specification for OpenOffice.org XML, the default format for `OpenOffice.org` and `LibreOffice`. It was originally developed for `StarOffice` \"to provide an open standard for office documents.\"\n",
+    "\n",
+    "The `UnstructuredODTLoader` is used to load `Open Office ODT` files."
    ]
   },
   {
@@ -68,7 +72,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.13"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,

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

@@ -7,7 +7,7 @@
    "source": [
     "# 2Markdown\n",
     "\n",
-    "Uses [2markdown](https://2markdown.com/) to convert any webpage into a standard markdown file"
+    ">[2markdown](https://2markdown.com/) service transforms website content into structured markdown files.\n"
    ]
   },
   {
@@ -17,7 +17,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# You will need to get your own API key\n",
+    "# You will need to get your own API key. See https://2markdown.com/login\n",
     "\n",
     "api_key = \"\""
    ]
@@ -56,9 +56,7 @@
    "cell_type": "code",
    "execution_count": 8,
    "id": "706304e9",
-   "metadata": {
-    "scrolled": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
@@ -220,7 +218,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.1"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,