Clarify JSONL as the Returned Format for Streaming JSON Objects

**Current Documentation**: [API documentation](https://github.com/ollama/ollama/blob/4759d879f2376ffb9b82f296e442ec8ef137f27b/docs/api.md?plain=1#L79) states: > A stream of JSON objects is returned. **Proposal**: Specify the format explicitly as: > A stream of JSON objects in [JSON Lines (JSONL)] format is returned. **Reasoning**: By constraining the format to JSONL (i.e., each JSON object is serialized on a separate line as per [jsonlines.org](https://jsonlines.org/)), parsing implementations become simpler. Instead of relying on complex JSON parsing to determine object boundaries—especially when JSON content may include brackets—developers can leverage line-buffered iterators to process incoming chunks more efficiently. This clarification aligns the documentation with common parsing practices for streaming JSON data and reduces potential ambiguity.