docs: remove keyterms prompting not supported callouts for multilingual streaming

Co-Authored-By: Ryan Seams <[email protected]>

Author: devin-ai-integration[bot]

fern/pages/07-use-cases/voice-agent-best-practices.mdx

@@ -62,7 +62,6 @@ Universal-Streaming supports two modes:
 - Supports: English, Spanish, French, German, Italian, Portuguese
 - Automatic language detection and code-switching
 - Maintains context across language changes
-- Note: Keyterms prompting not currently supported
 
 To enable multilingual mode, set `"language": "multi"` in connection parameters.
 
@@ -77,7 +76,7 @@ To enable multilingual mode, set `"language": "multi"` in connection parameters.
 - Built-in VAD (Voice Activity Detection)
 
 **Accuracy Enhancements:**
-- **Keyterms Prompting** (English-only): Up to 100 custom terms per session
+- **Keyterms Prompting**: Up to 100 custom terms per session
   - 21% better accuracy on domain-specific terminology
   - Word-level and turn-level boosting
   - Cost: +$0.04/hour