Single error operators marbles

[UMFsimke]

Here are marbles for #5788

For error(Callable)

For error(Throwable), only added error event to be red:

For onErrorReturn

For onErrorReturnItem

For onErrorResumeNext(SingleSource)

For onErrorResumeNext(Function)

[akarnokd]

For the onErrorX, please indicate the normal case via different marble (i.e., the usual split diagram).

Btw you can save yourself a commit if you follow the following naming in the JavaDocs:

https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.XXXX.png

where XXXX is the name of the operator, such as error and may contain argument indicator letters:

• s is for Schedulers or Single
• t is for timed
• n is for some numerical value
• f is for function or Flowable
• c is for callable or Completable
• p is for Publisher
• m is for Maybe or some other numerical value

Thus, the image naming of this PR will look like this:

-https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.error.c.png
-https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.error.png
-https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorReturn.png
-https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorReturnItem.png
-https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorResumeNext.png
-https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorResumeNext.f.png

[codecov]

Codecov Report

Merging #6086 into 2.x will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x    #6086      +/-   ##
============================================
+ Coverage     98.25%   98.26%   +0.01%     
+ Complexity     6197     6195       -2     
============================================
  Files           667      667              
  Lines         44858    44858              
  Branches       6211     6211              
============================================
+ Hits          44076    44081       +5     
+ Misses          239      231       -8     
- Partials        543      546       +3

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Single.java	100% <100%> (ø)	146 <1> (ø)	⬇️
...va/io/reactivex/internal/queue/SpscArrayQueue.java	97.61% <0%> (-2.39%)	22% <0%> (-1%)
.../io/reactivex/internal/schedulers/IoScheduler.java	89.24% <0%> (-2.16%)	9% <0%> (ø)
.../operators/observable/ObservableFlatMapSingle.java	88.8% <0%> (-1.5%)	2% <0%> (ø)
...a/io/reactivex/internal/util/QueueDrainHelper.java	97.22% <0%> (-1.39%)	56% <0%> (-1%)
...ex/internal/operators/flowable/FlowableCreate.java	95.8% <0%> (-1.3%)	6% <0%> (ø)
...ternal/operators/completable/CompletableMerge.java	96.42% <0%> (-1.2%)	2% <0%> (ø)
...rnal/operators/observable/ObservableSwitchMap.java	95.21% <0%> (-1.07%)	3% <0%> (ø)
...perators/mixed/ObservableSwitchMapCompletable.java	98.94% <0%> (-1.06%)	3% <0%> (ø)
...ava/io/reactivex/processors/BehaviorProcessor.java	98.2% <0%> (-0.9%)	59% <0%> (-1%)
... and 16 more

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[UMFsimke]

Images are now updated and PR as well with proper URLs. Thanks for detailed explanation!