Clarify session migration from framework to core

[twsouthwick]

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aspnetcore/migration/fx-to-core/areas/authentication.md	Migrate ASP.NET Framework Authentication to ASP.NET Core
aspnetcore/migration/fx-to-core/areas/claimsprincipal-current.md	Migrate from static ClaimsPrincipal access
aspnetcore/migration/fx-to-core/areas/http-context.md	Migrate ASP.NET Framework HttpContext to ASP.NET Core
aspnetcore/migration/fx-to-core/areas/http-handlers.md	aspnetcore/migration/fx-to-core/areas/http-handlers
aspnetcore/migration/fx-to-core/areas/index.md	Technology specific guidance
aspnetcore/migration/fx-to-core/areas/misc.md	Technical differences between ASP.NET Framework and ASP.NET Core
aspnetcore/migration/fx-to-core/areas/session.md	ASP.NET to ASP.NET Core session state migration
aspnetcore/migration/fx-to-core/inc/ab-testing.md	A/B Testing endpoints during migration
aspnetcore/migration/fx-to-core/inc/remote-app-setup.md	aspnetcore/migration/fx-to-core/inc/remote-app-setup
aspnetcore/migration/fx-to-core/inc/systemweb-adapters.md	System.Web adapters
aspnetcore/migration/fx-to-core/index.md	Migrate from ASP.NET Framework to ASP.NET Core
aspnetcore/migration/fx-to-core/start.md	Get started with incremental ASP.NET to ASP.NET Core migration
aspnetcore/migration/fx-to-core/tooling.md	Use tooling to help migrate ASP.NET Framework to ASP.NET Core
aspnetcore/security/cookie-sharing.md	aspnetcore/security/cookie-sharing
aspnetcore/toc.yml	aspnetcore/toc
aspnetcore/zone-pivot-groups.yml	aspnetcore/zone-pivot-groups

[twsouthwick]

superceded by #35755