Application Insights .Net SDK v2.15 - Asp.Net Core config changes

[TimothyMothra]

This issue is to track needed documentation changes for Application Insights .Net SDK v2.15 to be released on Tuesday, September 15th.

We've introduced config changes for Asp.Net Core scenarios that need to be documented with examples.
Source: microsoft/ApplicationInsights-dotnet#1882

Please assign this issue to @rajkumar-rangaraj and @mrbullwinkle.
Please label this issue Azure-Monitor/svc and application-insights/subsvc.

[KrishnaG-MSFT]

@TimothyMothra Thanks for the feedback. It would be better if you can provide list of affected doc's as you did for #62290.
Assigned to @rajkumar-rangaraj and @mrbullwinkle.