Vector2.Reflect : Missing: Normal must be normalized

### Type of issue

Typo

### Description

The documentation for Vector2.Reflect mentions using a normal vector, but it doesn’t explicitly state that the normal vector should be normalized. This can lead to confusion, as the reflection calculation assumes a normalized normal vector. Otherwise Reflect creates a wrong result.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.numerics.vector2.reflect?view=net-9.0

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Numerics/Vector2.xml

### Document Version Independent Id

43d18e54-0787-7c38-4591-b76f28408224

### Article author

@dotnet-bot