* loki.md: Add example of Loki data source config
It was little difficult to search an example of setting datasourceUid for Jaeger data source.
I found the answer from https://github.com/grafana/grafana/issues/26087 and thought it would be good to document it.
* Update docs/sources/datasources/loki.md
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
* Update docs/sources/datasources/loki.md
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
