message: docs(ReplaySubject): typo 'fo' should be 'of'
  From:  with a couple fo exceptions
  To: with a couple of exceptions
  Description: typo
  BREAKING CHANGE: N/A
  Related issue (if exists): N/A
diff: @@ -25,7 +25,7 @@ import { dateTimestampProvider } from './scheduler/dateTimestampProvider';
  *
  * ### Differences with BehaviorSubject
  *
  - * `BehaviorSubject` is similar to `new ReplaySubject(1)`, with a couple fo exceptions:
  + * `BehaviorSubject` is similar to `new ReplaySubject(1)`, with a couple of exceptions:
  *
  * 1. `BehaviorSubject` comes "primed" with a single value upon construction.
  * 2. `ReplaySubject` will replay values, even after observing an error, where `BehaviorSubject` will not.
  