Update doc/observability/metrics.md

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

doc/observability/metrics.md

@@ -37,7 +37,7 @@ One of the main metrics would be `istio_requests_total`, which is a counter incr
 Latency metrics are available via the `istio_request_duration_milliseconds` metric, with buckets for varying response times.
 
 Some example dashboards have panels that make use of the request url path.
-The path is *not* added as a label to istio metrics by default, as it has the potential
+The path is *not* added as a label to Istio metrics by default, as it has the potential
 to increase metric cardinality, and thus storage requirements.
 If you want to make use of the path in your queries or visualisations, you can enable
 the request path metric via the [Telemetry resource](https://istio.io/latest/docs/reference/config/telemetry/#MetricSelector-IstioMetric) in istio: