changed to use setInterval in test

[jatkz]

Summary

I want to fix a typo in documentation

Set of changes

The test seems to be checking on an interval for if the observable pipe subscription is mutating on an interval. The code used setTimeout and I changed to setInterval otherwise the test would never reach done()

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[kitten]

Closing since this didn't receive activity in the discussion thread. FWIW, when only a single "signal" is tested, I'd never want to resort to an interval, since it's just not what's being tested. Even using setTimeout without mock timers, feels like code smell, imho, so I wouldn't outright recommend it.