Search box visibility paragraph lacks description of UWA behavior

### Type of issue

Missing information

### Description

In the documentation, the corresponding [paragraph](https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/shell/search?view=net-maui-9.0#search-box-visibility) reads as:

> On **iOS** the search box is revealed by vertically bouncing the page content, and on **Android** the search box is revealed by tapping the question mark icon.

What is the behavior of UWA apps?

### Page URL

https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/shell/search?view=net-maui-9.0

### Content source URL

https://github.com/dotnet/docs-maui/blob/main/docs/fundamentals/shell/search.md

### Document Version Independent Id

20d6b4f2-f620-90f4-19f4-89b369f71c41

### Platform Id

f5fe0437-09c6-e8c6-bed5-89d0ad6f70c5

### Article author

@davidortinau

### Metadata

* ID: 20d6b4f2-f620-90f4-19f4-89b369f71c41
* PlatformId: f5fe0437-09c6-e8c6-bed5-89d0ad6f70c5
* Service: **dotnet-mobile**
* Sub-service: **dotnet-maui**

[Related Issues](https://github.com/dotnet/docs-maui/issues?q=is%3Aissue+is%3Aopen+20d6b4f2-f620-90f4-19f4-89b369f71c41)