Remove warning about catch-all bug in 5.0 version

Author: Rick Anderson

aspnetcore/fundamentals/routing.md

@@ -323,8 +323,6 @@ Due to the kinds of extensibility provided by routing, it isn't possible for the
 > 
 > * Doesn't have a concept of routes.
 > * Doesn't provide ordering guarantees. All endpoints are processed at once.
->
-> If this means you're stuck using the legacy routing system, [open a GitHub issue for assistance](https://github.com/dotnet/aspnetcore/issues).
 
 <a name="rtp"></a>
 

aspnetcore/includes/catchall.md

@@ -1,3 +1,5 @@
+::: moniker range=">= aspnetcore-3.0 < aspnetcore-5.0"
+
 > [!WARNING]
 > A **catch-all** parameter may match routes incorrectly due to a [bug](https://github.com/dotnet/aspnetcore/issues/18677) in routing. Apps impacted by this bug have the following characteristics:
 >
@@ -17,4 +19,6 @@
 >    CreateHostBuilder(args).Build().Run();
 >}
 >// Remaining code removed for brevity.
->```
+>```
+
+::: moniker-end