Bump Azure.Monitor.OpenTelemetry.AspNetCore from 1.3.0-beta.1 to 1.3.0-beta.2 in /docs/core/diagnostics/snippets/OTLP-Example/csharp in the dotnet group

Bump Azure.Monitor.OpenTelemetry.AspNetCore from 1.3.0-beta.1 to 1.3.0-beta.2 in /docs/core/diagnostics/snippets/OTLP-Example/csharp in the dotnet group #1451