Update block docs for: youtube.md

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+# YouTube Blocks
+
+## YouTube Video Transcriber
+
+### What it is
+A tool that converts spoken content from YouTube videos into written text format.
+
+### What it does
+Takes a YouTube video URL and produces a text transcript of all spoken content in the video. It can handle various YouTube URL formats, including standard watch URLs, shortened URLs (youtu.be), and embedded video URLs.
+
+### How it works
+1. Takes your provided YouTube video URL
+2. Extracts the unique video identifier from the URL
+3. Searches for available transcripts for the video
+4. Retrieves the transcript in the first available language
+5. Formats the transcript into clean, readable text
+
+### Inputs
+- YouTube URL: The web address of the YouTube video you want to transcribe. This can be in any standard YouTube format (e.g., regular watch URL, shortened URL, or embed URL)
+
+### Outputs
+- Video ID: The unique identifier for the YouTube video
+- Transcript: The complete text version of the video's spoken content
+- Error: A message explaining what went wrong if the transcription fails
+
+### Possible use cases
+- A content creator wanting to create subtitles or captions for their videos
+- A student needing to reference specific parts of a lecture video
+- A researcher collecting data from educational videos
+- A marketing team analyzing competitor video content
+- A journalist quoting from video interviews
+- Making video content accessible to deaf or hard-of-hearing viewers
+
+### Notes
+- The video must have available transcripts (either auto-generated or manually created)
+- The tool will use the first available language version of the transcript
+- Works with both public and unlisted videos (as long as you have the URL)