[Docs][Concurrency] Document custom executors in API docs a bit #73634
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Based on https://forums.swift.org/t/how-to-properly-use-custom-executor-on-global-actor/71829/ I realized we don't do a good job documenting custom executors (and other things, but let's start with this) on API docs.
This introduces some basic example and wording in the Actor and SerialExecutor types.
More should be preferably done in the TSPL, but we'll handle that separately.
Resolves rdar://128060412 rdar://129115666