HTTP Server Duration Histogram description does not follow specification

[austinlparker]

Line in question:

opentelemetry-dotnet/src/OpenTelemetry.Instrumentation.AspNetCore/Implementation/HttpInMetricsListener.cs

Line 42 in b549e12

this.httpServerDuration = meter.CreateHistogram<double>(HttpServerDurationMetricName, "ms", "measures the duration of the inbound HTTP request");

Spec reference: https://github.com/open-telemetry/opentelemetry-specification/blob/84a5fa3d1ef42caae8f99f1b431504d7cdb9fffe/specification/metrics/semantic_conventions/http-metrics.md?plain=1#L24

This impacts the OpenTelemetry Demo (open-telemetry/opentelemetry-demo#737) as we are emitting this metric from multiple languages. When the description differs between the same metric name, the prometheus exporter on the collector can't merge the points.

[cijothomas]

Typo. @vishweshbankwar can you fix? (also double check if there are others as well for metrics)