message: added missing `switchAll` link
diff: @@ -215,6 +215,7 @@ Also see the [Join Creation Operators](#join-creation-operators) section above.
  - [`concatAll`](/api/operators/concatAll)
  - [`exhaust`](/api/operators/exhaust)
  - [`mergeAll`](/api/operators/mergeAll)
  +- [`switchAll`](/api/operators/switchAll)
  - [`startWith`](/api/operators/startWith)
  - [`withLatestFrom`](/api/operators/withLatestFrom)
  