Update .env.example

Author: wtfsayo

.env.example

@@ -82,6 +82,7 @@ MEDIUM_OPENAI_MODEL=            # Default: gpt-4o
 LARGE_OPENAI_MODEL=             # Default: gpt-4o
 EMBEDDING_OPENAI_MODEL=         # Default: text-embedding-3-small
 IMAGE_OPENAI_MODEL=             # Default: dall-e-3
+USE_OPENAI_EMBEDDING=           # Set to TRUE for OpenAI/1536, leave blank for local
 
 # Eternal AI's Decentralized Inference API
 ETERNALAI_URL=