js client library documentation

- show example of using `getQueryLines`
- show what will be returned from the request
- show example with giraffe

Locate the existing JavaScript client documentation and the getQueryLines entry point; no file is named in the issue, so first identify where client usage examples live. Add an example using getQueryLines, show the request result, and include a giraffe example so the documentation covers all three requested cases.

Written by the indexing model from the issue text.