3.x: Update marbles of amb(), ambArray() and ambWith()

[akarnokd]

Update the marble diagrams in Flowable and Observable, indicating cancellation of the non-winners.

Resolves #6995

[codecov]

Codecov Report

Merging #7144 (f1e8984) into 3.x (b75c185) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #7144      +/-   ##
============================================
- Coverage     99.57%   99.50%   -0.07%     
+ Complexity     6706     6705       -1     
============================================
  Files           745      745              
  Lines         47327    47327              
  Branches       6375     6375              
============================================
- Hits          47124    47091      -33     
- Misses           89      109      +20     
- Partials        114      127      +13     

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/rxjava3/core/Flowable.java	100.00% <ø> (ø)	597.00 <0.00> (ø)
...ain/java/io/reactivex/rxjava3/core/Observable.java	100.00% <ø> (ø)	565.00 <0.00> (ø)
...ors/flowable/FlowableOnBackpressureReduceWith.java	88.00% <0.00%> (-12.00%)	2.00% <0.00%> (ø%)
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	89.90% <0.00%> (-8.26%)	2.00% <0.00%> (ø%)
...l/operators/observable/ObservableFlatMapMaybe.java	92.25% <0.00%> (-4.23%)	2.00% <0.00%> (ø%)
...rnal/operators/flowable/FlowableFlatMapSingle.java	94.18% <0.00%> (-3.49%)	2.00% <0.00%> (ø%)
...xjava3/internal/observers/FutureMultiObserver.java	96.61% <0.00%> (-3.39%)	27.00% <0.00%> (-1.00%)
...a/io/reactivex/rxjava3/subjects/SingleSubject.java	97.53% <0.00%> (-2.47%)	37.00% <0.00%> (-1.00%)
...nternal/operators/parallel/ParallelSortedJoin.java	98.49% <0.00%> (-1.51%)	2.00% <0.00%> (ø%)
...ternal/operators/completable/CompletableMerge.java	97.29% <0.00%> (-1.36%)	2.00% <0.00%> (ø%)
... and 10 more

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