docs: Update NSQL API for optional model and sample_data default (#1717)

Author: claudespice

website/docs/api/HTTP/post-nsql.api.mdx

@@ -59,7 +59,7 @@ When `stream` is true, the response is streamed as Server-Sent Events (SSE).
 
 <RequestSchema
   title={"Body"}
-  body={{"description":"Request body to generate an NSQL query","content":{"application/json":{"schema":{"type":"object","required":["query"],"properties":{"datasets":{"type":["array","null"],"items":{"type":"string"},"description":"Names of datasets to sample from when constructing model context; this is a sampling hint and does not restrict which tables queries can target. If omitted, all datasets are used."},"model":{"type":"string","description":"The name of the model to use for SQL generation. Default: \"nql\""},"query":{"type":"string","description":"The natural language query to be converted into SQL"},"sample_data_enabled":{"type":"boolean","description":"Whether sample data is included in the context for SQL generation. Default: true"},"stream":{"type":"boolean","description":"If true, streams the response instead of waiting for completion"}},"title":"Request"},"example":{"query":"Get the top 5 customers by total sales","model":"nql","stream":false,"sample_data_enabled":true,"datasets":["sales_data"]}}},"required":true}}
+  body={{"description":"Request body to generate an NSQL query","content":{"application/json":{"schema":{"type":"object","required":["query"],"properties":{"datasets":{"type":["array","null"],"items":{"type":"string"},"description":"Names of datasets to sample from when constructing model context; this is a sampling hint and does not restrict which tables queries can target. If omitted, all datasets are used."},"model":{"type":"string","description":"The name of the model to use for SQL generation. If omitted, Spice defaults to the only compatible LLM model configured in the Spicepod."},"query":{"type":"string","description":"The natural language query to be converted into SQL"},"sample_data_enabled":{"type":"boolean","description":"Whether sample data is included in the context for SQL generation. Default: false"},"stream":{"type":"boolean","description":"If true, streams the response instead of waiting for completion"}},"title":"Request"},"example":{"query":"Get the top 5 customers by total sales","stream":false,"sample_data_enabled":false,"datasets":["sales_data"]}}},"required":true}}
 >
 
 </RequestSchema>