Fixed Javadoc for SingleFlatMapIterableObservable.

[leonardortlima]

Fixed Javadoc for SingleFlatMapIterableObservable.

[codecov]

Codecov Report

Merging #5383 into 2.x will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5383      +/-   ##
============================================
- Coverage     96.17%   96.16%   -0.01%     
+ Complexity     5789     5784       -5     
============================================
  Files           630      630              
  Lines         41189    41189              
  Branches       5726     5726              
============================================
- Hits          39613    39611       -2     
+ Misses          624      621       -3     
- Partials        952      957       +5

Impacted Files	Coverage Δ	Complexity Δ
...rators/single/SingleFlatMapIterableObservable.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...rnal/subscribers/SinglePostCompleteSubscriber.java	94.87% <0%> (-5.13%)	14% <0%> (-1%)
...ternal/operators/observable/ObservablePublish.java	91.22% <0%> (-4.39%)	9% <0%> (-1%)
...io/reactivex/internal/util/BackpressureHelper.java	95.91% <0%> (-4.09%)	21% <0%> (-1%)
...erators/completable/CompletableConcatIterable.java	95.91% <0%> (-4.09%)	2% <0%> (ø)
...vex/internal/operators/flowable/FlowableTimer.java	92.85% <0%> (-3.58%)	2% <0%> (ø)
...vex/internal/operators/single/SingleTakeUntil.java	91.8% <0%> (-3.28%)	2% <0%> (ø)
...activex/internal/operators/single/SingleCache.java	97.05% <0%> (-2.95%)	23% <0%> (-1%)
...main/java/io/reactivex/subjects/SingleSubject.java	95.23% <0%> (-2.39%)	38% <0%> (-1%)
.../main/java/io/reactivex/subjects/AsyncSubject.java	97.41% <0%> (-1.73%)	55% <0%> (-1%)
... and 34 more

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