Update doc/observability/metrics.md

Co-authored-by: Jason Madigan <[email protected]>

doc/observability/metrics.md

@@ -78,7 +78,7 @@ in the kubernetes world.
 
 Metric queries can be as simple as just the name of the metric, or can be complex
 with joining & grouping. A lot of the time it can be useful to tie back low level
-metrics to more meaningful kubernetes resources. For example, if the memory usage
+metrics to more meaningful Kubernetes resources. For example, if the memory usage
 is maxed out on a container and that container is constantly being OOMKilled, it
 can be useful to get the Deployment and Namespace of that container for debugging.
 Prometheus query language (or promql) allows [vector matching](https://prometheus.io/docs/prometheus/latest/querying/operators/#vector-matching)