`Regex.EnumerateMatches` docs missing `TimeoutException`

### Type of issue

Typo

### Description

When setting the `matchTimeout` parameter a `TimeoutException` can be thrown.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex.enumeratematches?view=net-9.0

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Text.RegularExpressions/Regex.xml

### Document Version Independent Id

a7a24720-54fc-47fe-1f85-09dd1b7b357a

### Article author

@dotnet-bot