Update readme to RC 1 update

Author: dodyg

README.md

@@ -1,6 +1,6 @@
-# Samples for ASP.NET Core 6.0, 7.0 and 8.0 Preview 7 (494)
+# Samples for ASP.NET Core 6.0, 7.0 and 8.0 RC 1 (494)
 
-- Samples for ASP.NET Core **8.0 Preview 7** is available [here](/projects/.net8) (32).
+- Samples for ASP.NET Core **8.0 RC 1** is available [here](/projects/.net8) (32).
 - Samples for ASP.NET Core **7.0** is available [here](/projects/.net7) (45).
 - Samples for ASP.NET Core **8.0 Preview 6** using EdgeDB.NET is [here](https://github.com/edgedb/edgedb-net).
 

projects/.net8/README.md

@@ -1,6 +1,6 @@
 # ASP.NET 8.0 Preview 7 (32)
 
-These samples require [.NET 8.0 Preview 7](https://github.com/dotnet/installer#table). 
+These samples require [.NET 8.0 RC 1](https://github.com/dotnet/installer#table). 
 
 * [QuickGrid One](QuickGridOne)