fix(Caching): sweep archived threads in all channel caches

[ckohen]

Please describe the changes this PR makes and why it should be merged:

Fixes a bug in the current sweeping of caches where ThreadChannels would remain in the client and guild channel caches, only being removed from the thread channel caches.

Allows a bit more control over how thread channels are swept from these caches without triggering the process warning for overriding the channel caches.

Also fixes a minor documentation error in LimitedCollection.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)
• This PR includes breaking changes (methods removed or renamed, parameters moved or removed)

[iCrawl]

Really liking the utility function 👍