Update block docs for: unreal_text_to_speech.md

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+## Unreal Text to Speech
+
+### What it is
+A specialized block that converts written text into spoken audio using the Unreal Speech API, offering high-quality text-to-speech conversion capabilities.
+
+### What it does
+This block takes written text and transforms it into natural-sounding speech, generating an audio file that can be accessed via a URL. It allows users to specify the voice they want to use for the audio generation.
+
+### How it works
+The block operates by:
+1. Taking the input text and voice selection from the user
+2. Sending this information to the Unreal Speech API
+3. Processing the text using the specified voice settings
+4. Generating an MP3 audio file
+5. Providing a URL to access the generated audio
+
+### Inputs
+- Text: The written content you want to convert into speech. This can be any text that you want to hear spoken aloud.
+- Voice ID: The specific voice you want to use for the speech generation. By default, it uses a voice called "Scarlett," but other voices can be selected.
+- Credentials: Authentication details required to access the Unreal Speech API. This includes an API key with the necessary permissions.
+
+### Outputs
+- MP3 URL: A web address (URL) where you can access and play the generated audio file.
+- Error: A message explaining what went wrong if the text-to-speech conversion fails for any reason.
+
+### Possible use cases
+- Creating audio versions of written content for accessibility purposes
+- Developing voice-overs for videos or presentations
+- Building interactive voice responses for applications
+- Generating automated announcements or notifications
+- Creating audio content for e-learning materials
+- Producing spoken versions of articles or blog posts
+- Developing voice-enabled assistants or chatbots
+- Creating audio books from written text
+
+### Technical Categories
+- AI
+- Text Processing
+
+### Notes
+- The block uses high-quality audio settings with a 192k bitrate
+- The speech can be customized with additional parameters like speed and pitch
+- The system supports sentence-level timestamps for precise audio timing