Loki is a component, not the entire stack (#146)

* Loki is a component, not the entire stack

* Loki has a capital el.

README.md

@@ -15,7 +15,7 @@ Compared to other log aggregation systems, Loki:
 - is an especially good fit for storing [Kubernetes](https://kubernetes.io/) Pod logs. Metadata such as Pod labels is automatically scraped and indexed.
 - has native support in Grafana (already in the nightly builds, will be included in Grafana 6.0).
 
-Loki consists of 3 components:
+A Loki-based logging stack consists of 3 components:
 
 - `loki` is the main server, responsible for storing logs and processing queries.
 - `promtail` is the agent, responsible for gathering logs and sending them to loki.
@@ -47,4 +47,4 @@ Your feedback is always welcome.
 
 [kccna18-event]: https://kccna18.sched.com/event/GrXC/on-the-oss-path-to-full-observability-with-grafana-david-kaltschmidt-grafana-labs
 [kccna18-slides]: https://speakerdeck.com/davkal/on-the-path-to-full-observability-with-oss-and-launch-of-loki
-[kccna18-video]: https://www.youtube.com/watch?v=tpJRG_ijKe0
+[kccna18-video]: https://www.youtube.com/watch?v=tpJRG_ijKe0