Merge general async guidance into the docs

There are some good guides around using async, such as:

https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/blob/master/AsyncGuidance.md

Could I request that these tips be merged into the remarks section of individual class/method/property documents (such as https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.taskcompletionsource-1?view=net-5.0) as well as maybe having a dedicated section within dotnet or asp.net?