update env example

Author: erhant

.env.example

@@ -3,7 +3,7 @@
 # e.g.: DKN_WALLET_SECRET_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
 DKN_WALLET_SECRET_KEY=
 # model1,model2,model3,... (comma separated, case-insensitive)
-# example: phi3:3.8b,gpt-4o-mini
+# example: gemini-2.0-flash,gpt-4o-mini
 DKN_MODELS=
 
 ## DRIA (optional) ##
@@ -19,14 +19,10 @@ DKN_BATCH_SIZE=
 # Otherwise, leave this empty.
 # DKN_EXIT_TIMEOUT=
 
-
-
 ## Open AI (if used, required) ##
 OPENAI_API_KEY=
-
 ## Gemini (if used, required) ##
 GEMINI_API_KEY=
-
 ## Open Router (if used, required) ##
 OPENROUTER_API_KEY=
 
@@ -37,7 +33,3 @@ OLLAMA_PORT=11434
 # if "true", automatically pull models from Ollama
 # if "false", you have to download manually
 OLLAMA_AUTO_PULL=true
-
-## Additional Services (optional)
-SERPER_API_KEY=
-JINA_API_KEY=