Top-level declaration for type System.String is incomplete

### Type of issue

Missing information

### Description

The top-level declaration for type `System.String` is, as follows:

```csharp
public sealed class String : ICloneable, IComparable, IComparable,
IConvertible, IEquatable, IParsable, ISpanParsable,
System.Collections.Generic.IEnumerable
```

However, interface `System.Collections.IEnumerable` needs to be added as well. This interface *is* listed in the "Implements" list immediately following, and it *is* in the type's source code.

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### Page URL

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

### Content source URL

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

### Document Version Independent Id

de28387f-e401-9ecd-1fc0-a9e37d55d6ea

### Platform Id

ea5ee17b-a431-9cf9-8b95-ec61e38a8fd3

### Article author

@dotnet-bot