prometheus scraping endpoint changed to UseOpenTelemetryPrometheusScrapingEndpoint

### Type of issue

Outdated article

### Description

To configure the Prometheus scraping endpoint the method have been updated to:

`app.UseOpenTelemetryPrometheusScrapingEndpoint()`

For more information follow this https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/README.md

### Page URL

https://learn.microsoft.com/en-us/dotnet/core/diagnostics/observability-prgrja-example

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/diagnostics/observability-prgrja-example.md

### Document Version Independent Id

59d4807e-8b88-9d39-cd51-977792064cf6

### Article author

@tommcdon

### Metadata

* ID: eded9b69-1a38-a8bb-7e76-2f72a2e78abe
* Service: **dotnet-fundamentals**

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