Replace private YouTube video

As per #3649 (comment)

Author: iBug

docs/_docs/14-helpers.md

@@ -186,20 +186,20 @@ Embed a video from YouTube, Vimeo, Google Drive, or bilibili that responsively s
 
 ### YouTube
 
-To embed the following YouTube video at url `https://www.youtube.com/watch?v=XsxDH4HcOWA` (long version) or `https://youtu.be/XsxDH4HcOWA` (short version) into a post or page's main content you'd use:
+To embed the following YouTube video at url `https://www.youtube.com/watch?v=-PVofD2A9t8` (long version) or `https://youtu.be/-PVofD2A9t8` (short version) into a post or page's main content you'd use:
 
 ```liquid
-{% raw %}{% include video id="XsxDH4HcOWA" provider="youtube" %}{% endraw %}
+{% raw %}{% include video id="-PVofD2A9t8" provider="youtube" %}{% endraw %}
 ```
 
-{% include video id="XsxDH4HcOWA" provider="youtube" %}
+{% include video id="-PVofD2A9t8" provider="youtube" %}
 
 To embed it as a video header you'd use the following YAML Front Matter
 
 ```yaml
 header:
   video:
-    id: XsxDH4HcOWA
+    id: -PVofD2A9t8
     provider: youtube
 ```