Update block docs for: sampling.md

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+## Create Talking Avatar Video
+
+### What it is
+A specialized block that creates personalized video content featuring an AI-powered talking avatar using the D-ID platform.
+
+### What it does
+This block transforms text input into a video featuring a digital presenter who speaks the provided script. It can create videos with different voices, presenters, and formatting options, with the ability to include subtitles if desired.
+
+### How it works
+The block takes your input text and configuration options, sends them to the D-ID service, and monitors the video creation process. Once the video is ready, it provides you with a URL where you can access the finished video.
+
+### Inputs
+- Credentials: D-ID API key required for accessing the service
+- Script Input: The text that the avatar will speak in the video
+- Voice Provider: Choice of voice service (Microsoft, ElevenLabs, or Amazon)
+- Voice ID: Specific voice identifier for the chosen provider
+- Presenter ID: The digital avatar that will appear in the video
+- Driver ID: Controls how the avatar animates
+- Result Format: Output format of the video (MP4, GIF, or WAV)
+- Crop Type: Video frame format (wide, square, or vertical)
+- Subtitles: Option to include subtitles in the video
+- SSML: Option to use Speech Synthesis Markup Language for more control over speech
+- Max Polling Attempts: Number of times to check if the video is ready
+- Polling Interval: Time to wait between checking video status
+
+### Outputs
+- Video URL: Web address where the completed video can be accessed
+- Error: Message explaining what went wrong if the video creation fails
+
+### Possible use case
+A marketing team wants to create personalized welcome videos for new customers. They could use this block to generate videos where a digital presenter greets each customer by name and explains the company's key features. The team could select a professional-looking avatar, choose an appropriate voice, and even include subtitles for accessibility.
+
+For example:
+1. Input a script: "Welcome, [Customer Name]! We're excited to have you join us..."
+2. Select a professional presenter avatar
+3. Choose a natural-sounding voice
+4. Enable subtitles for accessibility
+5. Get back a video URL that can be sent to the customer
+
+This creates a scalable way to deliver personalized video content without needing to record individual videos for each customer.
+