Fix typo in Flowable javadoc

[richardkapolnai-da]

Fix compilation error in example code in javadoc

[codecov]

Codecov Report

Merging #6760 into 3.x will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #6760      +/-   ##
============================================
- Coverage     98.08%   98.08%   -0.01%     
+ Complexity     6190     6186       -4     
============================================
  Files           677      677              
  Lines         44626    44626              
  Branches       6161     6161              
============================================
- Hits          43773    43771       -2     
+ Misses          310      309       -1     
- Partials        543      546       +3

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/rxjava3/core/Flowable.java	100% <ø> (ø)	559 <0> (ø)	⬇️
...java3/internal/observers/FutureSingleObserver.java	88.67% <0%> (-5.67%)	23% <0%> (-1%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	88.02% <0%> (-3.65%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	92.44% <0%> (-2.91%)	2% <0%> (ø)
...rxjava3/internal/observers/QueueDrainObserver.java	97.43% <0%> (-2.57%)	21% <0%> (-1%)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...nternal/operators/observable/ObservableWindow.java	98% <0%> (-2%)	3% <0%> (ø)
...a3/internal/subscribers/InnerQueuedSubscriber.java	96.07% <0%> (-1.97%)	18% <0%> (-1%)
...ava3/internal/operators/maybe/MaybeMergeArray.java	96.04% <0%> (-1.13%)	6% <0%> (ø)
...internal/operators/flowable/FlowableObserveOn.java	96.65% <0%> (-0.84%)	3% <0%> (ø)
... and 12 more

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