docs: ecosystem/integrations update 2 (#5282)

# docs: ecosystem/integrations update 2

#5219 - part 1 
The second part of this update (parts are independent of each other! no
overlap):

- added diffbot.md
- updated confluence.ipynb; added confluence.md
- updated college_confidential.md
- updated openai.md
- added blackboard.md
- added bilibili.md
- added azure_blob_storage.md
- added azlyrics.md
- added aws_s3.md

## Who can review?

@hwchase17@agola11
@agola11
 @vowelparrot
 @dev2049

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

@@ -11,7 +11,7 @@
     ">It starts with computer vision, which classifies a page into one of 20 possible types. Content is then interpreted by a machine learning model trained to identify the key attributes on a page based on its type.\n",
     ">The result is a website transformed into clean structured data (like JSON or CSV), ready for your application.\n",
     "\n",
-    "This covers how to extract HTML documents from a list of URLs using the [Diffbot extract API](https://www.diffbot.com/products/extract/), into a document format that we can use downstream."
+    "This covers how to extract HTML documents from a list of URLs using the [Diffbot extract API](https://www.diffbot.com/products/extract/), into a document format that we can use downstream.\n"
    ]
   },
   {
@@ -31,7 +31,9 @@
    "id": "6fffec88",
    "metadata": {},
    "source": [
-    "The Diffbot Extract API Requires an API token. Once you have it, you can extract the data from the previous URLs\n"
+    "The Diffbot Extract API Requires an API token. Once you have it, you can extract the data.\n",
+    "\n",
+    "Read [instructions](https://docs.diffbot.com/reference/authentication) how to get the Diffbot API Token."
    ]
   },
   {