docs: Update template command (#341)

Update template command given the current one is not valid:
```
$ dotnet new -n Sandbox.Generated.Operator operator
Error: Invalid option(s):
  operator
For usage information, run:
   dotnet new -h
```

Author: tomkerkhove

docs/docs/templates.md

@@ -36,7 +36,7 @@ _Type_: Generate a project
 
 _Templatename_: `operator-empty`
 
-_Example installation_: `dotnet new -n MyOperator operator-empty`
+_Example installation_: `dotnet new operator-empty -n MyOperator`
 
 _Description_:
 This template contains the well known `Program.cs`
@@ -52,7 +52,7 @@ _Type_: Generate a project
 
 _Templatename_: `operator`
 
-_Example installation_: `dotnet new -n MyOperator operator`
+_Example installation_: `dotnet new operator -n MyOperator`
 
 _Description_:
 This template contains the well known `Program.cs`