Examples have non-recommend value

### Type of issue

Other (describe below)

### Description

`` examples should not be set to `preview` when it's not recommended to use `latests` or `preview`.

_Don't set the LangVersion element to latest. The latest setting means the installed compiler uses its latest version. The value of latest can change from machine to machine, making builds unreliable. In addition, it enables language features that might require runtime or library features not included in the current SDK._

### Page URL

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/csharp/language-reference/configure-language-version.md

### Document Version Independent Id

3f01c378-22e4-197c-a862-ab4a924506c7

### Platform Id

cdf11e08-8e9a-84aa-affe-8a392bed026a

### Article author

@BillWagner

### Metadata

* ID: 5694e62b-c756-1f62-4014-2ceafa54c011
* PlatformId: cdf11e08-8e9a-84aa-affe-8a392bed026a
* Service: **dotnet-csharp**
* Sub-service: **lang-reference**

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