2.x: Add Maybe marble diagrams 06/21/a

[akarnokd]

Resolved the following diagrams of #5806:

amb: missing diagram

ambArray: missing diagram

concat(Iterable): missing diagram

concat(Publisher): missing diagram

concat(Publisher, int): missing diagram

concatArray: missing diagram

concatArrayDelayError: indicate error delayed, 1 marble per source

concatArrayEager: missing diagram

concatDelayError(Iterable): missing diagram

concatDelayError(Publisher): missing diagram

concatEager(Iterable): missing diagram

concatEager(Publisher): missing diagram

[codecov]

Codecov Report

Merging #6053 into 2.x will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #6053      +/-   ##
============================================
- Coverage     98.34%   98.27%   -0.07%     
+ Complexity     6194     6191       -3     
============================================
  Files           666      666              
  Lines         44802    44802              
  Branches       6206     6206              
============================================
- Hits          44059    44028      -31     
- Misses          222      232      +10     
- Partials        521      542      +21

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Maybe.java	100% <ø> (ø)	171 <0> (ø)	⬇️
...ernal/operators/flowable/FlowableFlatMapMaybe.java	92.75% <0%> (-3.87%)	2% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	96.46% <0%> (-3.54%)	11% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	92.93% <0%> (-2.72%)	2% <0%> (ø)
...tivex/internal/schedulers/TrampolineScheduler.java	96.1% <0%> (-2.6%)	6% <0%> (ø)
...activex/internal/observers/QueueDrainObserver.java	97.43% <0%> (-2.57%)	21% <0%> (-1%)
...ava/io/reactivex/processors/BehaviorProcessor.java	96.86% <0%> (-2.25%)	60% <0%> (ø)
...ernal/operators/flowable/FlowableFromIterable.java	94.11% <0%> (-2.14%)	5% <0%> (ø)
...nternal/operators/observable/ObservableWindow.java	98% <0%> (-2%)	3% <0%> (ø)
...java/io/reactivex/processors/PublishProcessor.java	98.19% <0%> (-1.81%)	42% <0%> (-1%)
... and 18 more

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