[Typo] Update Schedulers.java

[AllanWang]

Just a typo I came across while reading the javadocs.

[codecov]

Codecov Report

Merging #5552 into 2.x will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5552      +/-   ##
============================================
- Coverage     96.19%   96.16%   -0.04%     
- Complexity     5817     5826       +9     
============================================
  Files           631      631              
  Lines         41414    41414              
  Branches       5740     5740              
============================================
- Hits          39840    39826      -14     
- Misses          617      631      +14     
  Partials        957      957

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/schedulers/Schedulers.java	100% <ø> (ø)	10 <0> (ø)	⬇️
...in/java/io/reactivex/subjects/BehaviorSubject.java	86.97% <0%> (-5.73%)	57% <0%> (ø)
...erators/flowable/FlowableOnBackpressureLatest.java	94.59% <0%> (-5.41%)	2% <0%> (ø)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	90.82% <0%> (-4.84%)	2% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	91.22% <0%> (-3.51%)	11% <0%> (+1%)
.../io/reactivex/internal/schedulers/IoScheduler.java	89.24% <0%> (-3.23%)	9% <0%> (ø)
...rnal/operators/flowable/FlowableSkipLastTimed.java	95.91% <0%> (-2.05%)	2% <0%> (ø)
.../io/reactivex/disposables/CompositeDisposable.java	97.24% <0%> (-1.84%)	39% <0%> (-1%)
...internal/operators/completable/CompletableAmb.java	98.3% <0%> (-1.7%)	11% <0%> (ø)
.../operators/observable/ObservableSequenceEqual.java	98.31% <0%> (-0.85%)	2% <0%> (ø)
... and 19 more

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