2.x: update Obs.just(2..10) & switchOnNextDelayError marbles

[akarnokd]

This PR updates the marble diagrams of the 2..10 argument Observable.just() and two overloads of Observable.switchOnNextDelayError.

Images in Issue 5319.

[codecov]

Codecov Report

Merging #5651 into 2.x will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5651      +/-   ##
============================================
+ Coverage     96.16%   96.21%   +0.04%     
- Complexity     5848     5852       +4     
============================================
  Files           635      635              
  Lines         41652    41652              
  Branches       5768     5768              
============================================
+ Hits          40056    40075      +19     
+ Misses          635      622      -13     
+ Partials        961      955       -6

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Observable.java	100% <ø> (ø)	508 <0> (ø)	⬇️
...nternal/operators/parallel/ParallelReduceFull.java	91.17% <0%> (-3.93%)	2% <0%> (ø)
...tivex/internal/observers/FutureSingleObserver.java	94.33% <0%> (-3.78%)	24% <0%> (-1%)
...x/internal/operators/flowable/FlowablePublish.java	92.95% <0%> (-2.65%)	11% <0%> (+1%)
.../operators/observable/ObservableFlatMapSingle.java	88.8% <0%> (-2.24%)	2% <0%> (ø)
...nternal/operators/observable/ObservableWindow.java	98% <0%> (-2%)	3% <0%> (ø)
...perators/single/SingleFlatMapIterableFlowable.java	95.83% <0%> (-1.67%)	2% <0%> (ø)
...vex/internal/operators/single/SingleTakeUntil.java	93.44% <0%> (-1.64%)	2% <0%> (ø)
...nal/operators/flowable/FlowableConcatMapEager.java	97.1% <0%> (-1.16%)	2% <0%> (ø)
...reactivex/internal/queue/SpscLinkedArrayQueue.java	96.82% <0%> (-0.8%)	38% <0%> (-1%)
... and 22 more

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[vanniktech]

Don't you want to update the Flowable marbles too?

[akarnokd]

Flowable marbles require other adjustments, such as explicit request() indications. I first want Observable's marbles to be updated.