ReadOnlySequence<T>.Split methods should document their throws.

### Type of issue

Missing information

### Description

All of these methods throw if a value is out of range, they should probably document that.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/System.Buffers.ReadOnlySequence-1.Slice?view=net-9.0

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Buffers/ReadOnlySequence`1.xml

### Document Version Independent Id

b596ff0e-da12-58f9-8f77-7c16f67eac4f

### Article author

@dotnet-bot