TResult should be TNewResult in some cases

### Type of issue

Typo

### Description

In some of the versions where the continuation has a TNewResult the text still describes it as returning a TResult.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1.continuewith?view=net-9.0

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Threading.Tasks/Task`1.xml

### Document Version Independent Id

fe537193-0c9e-1d81-b479-bf960c2e0d7e

### Platform Id

24eb5806-7b26-af04-23b1-59c4a0e0249b

### Article author

@dotnet-bot