Add marble diagram for Single.hide operator

[UMFsimke]

This should complete hide operator in #5788

Please let me know if I need to change anything on the diagram itself. If not, please send me URL when you upload image within the project so I can change URL for the marble in the PR.

Although I wasn't sure if I should represent somehow that Disposable is hidden as well. If so, can you please tell me how to represent that on marble?

[codecov]

Codecov Report

Merging #6077 into 2.x will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #6077      +/-   ##
============================================
+ Coverage     98.26%   98.26%   +<.01%     
  Complexity     6192     6192              
============================================
  Files           666      666              
  Lines         44806    44806              
  Branches       6206     6206              
============================================
+ Hits          44028    44029       +1     
- Misses          236      237       +1     
+ Partials        542      540       -2

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Single.java	100% <ø> (ø)	146 <0> (ø)	⬇️
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0%> (-3.97%)	2% <0%> (ø)
...ava/io/reactivex/processors/BehaviorProcessor.java	96.86% <0%> (-2.25%)	60% <0%> (ø)
...x/internal/operators/flowable/FlowablePublish.java	97.44% <0%> (-1.71%)	11% <0%> (ø)
...a/io/reactivex/internal/util/QueueDrainHelper.java	98.61% <0%> (-1.39%)	57% <0%> (-1%)
...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)
...perators/observable/ObservableMergeWithSingle.java	99.06% <0%> (-0.94%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	94.89% <0%> (-0.73%)	2% <0%> (ø)
...ternal/operators/observable/ObservableFlatMap.java	86.58% <0%> (-0.64%)	3% <0%> (ø)
... and 18 more

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[akarnokd]

There should be a different superhero(ine) per reactive type who is relatively recognizable from the stylized head and doesn't require complicated drawings.

[UMFsimke]

Is this one suitable?

https://github.com/UMFsimke/RxJava/blob/Images/Images/Hide2.png

[akarnokd]

Yes.

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

[UMFsimke]

Thanks, updated

[UMFsimke]

I dont get it, why is CI failing. I've run tests locally and I dont get that error which CI is reporting.

[akarnokd]

Sometimes CI is a bit noisy and some of our millisecond-level tests can fail. I've restarted the build.