gRPC Troubleshoot: Fix moniker range (#34454)

Author: wadepickett

aspnetcore/grpc/troubleshoot.md

@@ -15,7 +15,7 @@ By [James Newton-King](https://twitter.com/jamesnk)
 
 [!INCLUDE[](~/includes/not-latest-version.md)]
 
-:::moniker range="= aspnetcore-8.0"
+:::moniker range=">= aspnetcore-8.0"
 
 This document discusses commonly encountered problems when developing gRPC apps on .NET.