Undocumented boolean returned by PeriodicTimer.WaitForNextTick?

### Type of issue

Missing information

### Description

Greetings.

I don't have much time to look more in details but it seems to me that the boolean value returned by `WaitForNextTick` is not clearly documented. Three possible events are mentioned:

- timer firing
- `Dispose()` call
- task cancellation

But the boolean value's meaning in relation to this isn't explicitly described. My guess would be that it is `true` if the timer fired and `false` in any other case?... But, well, that's a guess! :)

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.threading.periodictimer.waitfornexttickasync?view=net-8.0#system-threading-periodictimer-waitfornexttickasync(system-threading-cancellationtoken)

### Content source URL

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

### Document Version Independent Id

0ef31de4-0c6b-4ae5-b172-c2e89beee4cc

### Article author

@dotnet-bot