Correct dotnet new command for creating an aot grpc app (#35153)

Author: afscrome

aspnetcore/grpc/native-aot.md

@@ -30,10 +30,10 @@ AOT compilation happens when the app is published. Native AOT is enabled with th
 
     [!code-xml[](~/grpc/native-aot/Server.csproj?highlight=5)]
 
-    Native AOT can also be enabled by specifying the `-aot` option with the ASP.NET Core gRPC template:
+    Native AOT can also be enabled by specifying the `--aot` option with the ASP.NET Core gRPC template:
 
     ```dotnetcli
-    dotnet new grpc -aot
+    dotnet new grpc --aot
     ```
 
 2. Publish the app for a specific [runtime identifier (RID)](/dotnet/core/rid-catalog) using `dotnet publish -r <RID>`.