2.x: Update Single.flatMapPublisher marble

[akarnokd]

Renamed the operator in the box. For #5788.

[codecov]

Codecov Report

Merging #5924 into 2.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x    #5924   +/-   ##
=========================================
  Coverage     98.21%   98.21%           
+ Complexity     6020     6018    -2     
=========================================
  Files           656      656           
  Lines         44040    44040           
  Branches       6102     6102           
=========================================
  Hits          43255    43255           
+ Misses          241      239    -2     
- Partials        544      546    +2

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Single.java	100% <ø> (ø)	142 <0> (ø)	⬇️
...va/io/reactivex/internal/queue/SpscArrayQueue.java	97.61% <0%> (-2.39%)	22% <0%> (-1%)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...activex/internal/schedulers/ScheduledRunnable.java	98.07% <0%> (-1.93%)	29% <0%> (-1%)
...x/internal/operators/flowable/FlowablePublish.java	97.44% <0%> (-1.71%)	11% <0%> (ø)
...perators/mixed/ObservableConcatMapCompletable.java	98.49% <0%> (-1.51%)	3% <0%> (ø)
...internal/operators/flowable/FlowableSwitchMap.java	95.28% <0%> (-1.42%)	3% <0%> (ø)
...java/io/reactivex/processors/UnicastProcessor.java	98.8% <0%> (-1.2%)	67% <0%> (-1%)
...operators/observable/ObservableMergeWithMaybe.java	99.1% <0%> (-0.9%)	2% <0%> (ø)
...nternal/operators/observable/ObservableCreate.java	98.26% <0%> (-0.87%)	2% <0%> (ø)
... and 15 more

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