Fireworks AI: Fireworks serverless quickstart docs materially updated

System Baseline: Null

curl https://api.fireworks.ai/inference/v1/chat/completions \ -H "Content-Type: application/json" \ -H "Authorization: Bearer $FIREWORKS_API_KEY " \ -d '{ "model": "accounts/fireworks/models/qwen2p5-vl-32b-instruct", "messages": [ { "role": "user", "content": [ { "type": "text", "text": "What' \' 's in this image?" }, { "type": "image_url", "image_url": { "url": "https://storage.googleapis.com/fireworks-public/image_assets/fireworks-ai-wordmark-color-dark.png" } } ] } ] }'