Fixed doc for F.reduce(seed, reducer), F.reduceWith(seedSupplier, reducer) and O.reduce(seed, reducer)

[ganapathi004]

Corrected the doc for Issue No: #5476

[codecov]

Codecov Report

Merging #5478 into 2.x will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5478      +/-   ##
============================================
- Coverage     96.09%   96.07%   -0.02%     
+ Complexity     5803     5799       -4     
============================================
  Files           631      631              
  Lines         41297    41297              
  Branches       5743     5743              
============================================
- Hits          39683    39678       -5     
+ Misses          637      635       -2     
- Partials        977      984       +7

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Flowable.java	100% <ø> (ø)	523 <0> (ø)	⬇️
src/main/java/io/reactivex/Observable.java	100% <ø> (ø)	506 <0> (ø)	⬇️
...al/operators/observable/ObservableSampleTimed.java	91.66% <0%> (-6.67%)	3% <0%> (ø)
...ernal/operators/observable/ObservableInterval.java	96.42% <0%> (-3.58%)	3% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	89.47% <0%> (-2.64%)	9% <0%> (-1%)
...java/io/reactivex/subjects/CompletableSubject.java	94.8% <0%> (-2.6%)	35% <0%> (-1%)
...activex/internal/observers/QueueDrainObserver.java	61.53% <0%> (-2.57%)	12% <0%> (-1%)
...ternal/operators/completable/CompletableUsing.java	95.23% <0%> (-2.39%)	4% <0%> (ø)
...activex/internal/schedulers/ExecutorScheduler.java	94.59% <0%> (-2.03%)	9% <0%> (ø)
...vex/internal/subscribers/QueueDrainSubscriber.java	50% <0%> (-1.57%)	15% <0%> (-1%)
... and 26 more

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[akarnokd]

Thanks, I suspected there was more but GitHub is not able to display those files properly.