Update changelog for open-telemetry#5252

Author: alanwest

src/OpenTelemetry.Instrumentation.AspNetCore/CHANGELOG.md

@@ -21,6 +21,14 @@ Released 2024-Feb-09
   (see: [dotnet/aspnetcore#52652](https://github.com/dotnet/aspnetcore/pull/52652)).
   ([#5135](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5135))
 
+* Fixes scenario when the `net6.0` target of this library is loaded into a
+  .NET 7+ process and the instrumentation does not behave as expected. This
+  is an unusual scenario that does not affect users consuming this package
+  normally. This fix is primarily to support the
+  [opentelemetry-dotnet-instrumentation](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5252)
+  project.
+  ([#5252](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5252))
+
 ## 1.7.0
 
 Released 2023-Dec-13