[repo] Add "release details" links in release notes (open-telemetry#6096)

Author: CodeBlanch

RELEASENOTES.md

@@ -6,18 +6,24 @@ directory of each individual package.
 
 ## 1.11.1
 
+Release details: [1.11.1](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.11.1)
+
 * Fixed a bug preventing `OpenTelemetry.Exporter.OpenTelemetryProtocol` from
   exporting telemetry on .NET Framework.
 
 ## 1.11.0
 
+Release details: [1.11.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.11.0)
+
 * `OpenTelemetry.Exporter.OpenTelemetryProtocol` no longer depends on the
   `Google.Protobuf`, `Grpc`, or `Grpc.Net.Client` packages. Serialization and
   transmission of outgoing data is now performed manually to improve the overall
   performance.
 
 ## 1.10.0
 
+Release details: [1.10.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.10.0)
+
 * Bumped the package versions of `System.Diagnostic.DiagnosticSource` and other
   Microsoft.Extensions.* packages to `9.0.0`.
 
@@ -62,6 +68,8 @@ directory of each individual package.
 
 ## 1.9.0
 
+Release details: [1.9.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.9.0)
+
 * `Exemplars` are now part of the stable API! For details see: [customizing
   exemplars
   collection](https://github.com/open-telemetry/opentelemetry-dotnet/tree/main/docs/metrics/customizing-the-sdk#exemplars).
@@ -72,6 +80,8 @@ directory of each individual package.
 
 ## 1.8.0
 
+Release details: [1.8.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.8.0)
+
 * `TracerProvider` sampler can now be configured via the `OTEL_TRACES_SAMPLER` &
   `OTEL_TRACES_SAMPLER_ARG` envvars.
 
@@ -84,6 +94,8 @@ directory of each individual package.
 
 ## 1.7.0
 
+Release details: [1.7.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.7.0)
+
 * Bumped the package versions of System.Diagnostic.DiagnosticSource and other
   Microsoft.Extensions.* packages to `8.0.0`.