[UUF] System.CommandLine app throws exception

### Type of issue

Code doesn't work

### Description

Some of the instructions are incorrect. Possibly due to updates. For example, after displaying the finalized and finished application code, you instruct the reader to run: scl quotes read --file nofile. However, this still throws the stack trace exception. Adding a `fileOptions.Validators.Add` func can resolve this, but as this is outlined now the fileOption DefaultValueFactory does not execute for the quotes command.

### Page URL

https://learn.microsoft.com/en-us/dotnet/standard/commandline/get-started-tutorial

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/standard/commandline/get-started-tutorial.md

### Document Version Independent Id

fa160b1d-66ed-8c5d-37cd-b7e02443e9f1

### Platform Id

0f144444-1ce3-cdf7-87a6-c659d44e08d3

### Article author

@gewarren

### Metadata

* ID: 7705dc41-7297-0807-7e9c-2e6548c26b84
* PlatformId: 0f144444-1ce3-cdf7-87a6-c659d44e08d3
* Service: **dotnet-fundamentals**

[Related Issues](https://github.com/dotnet/docs/issues?q=is%3Aissue+is%3Aopen+fa160b1d-66ed-8c5d-37cd-b7e02443e9f1)