Fixed image link and added java examples for Connectable Observable operators

[kranthik2]

#6132

• Fixes image link
• updated examples with java

[codecov]

Codecov Report

Merging #6997 into 3.x will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #6997      +/-   ##
============================================
- Coverage     99.53%   99.48%   -0.05%     
- Complexity     6667     6669       +2     
============================================
  Files           742      742              
  Lines         47270    47270              
  Branches       6373     6373              
============================================
- Hits          47048    47027      -21     
- Misses          100      113      +13     
- Partials        122      130       +8     

Impacted Files	Coverage Δ	Complexity Δ
...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%)
...eactivex/rxjava3/processors/BehaviorProcessor.java	97.48% <0.00%> (-2.52%)	50.00% <0.00%> (ø%)
.../internal/disposables/ListCompositeDisposable.java	98.00% <0.00%> (-2.00%)	34.00% <0.00%> (-1.00%)
...a3/internal/operators/flowable/FlowableCreate.java	97.41% <0.00%> (-1.62%)	6.00% <0.00%> (ø%)
...nternal/operators/parallel/ParallelSortedJoin.java	98.49% <0.00%> (-1.51%)	2.00% <0.00%> (ø%)
...l/operators/observable/ObservableFlatMapMaybe.java	91.54% <0.00%> (-1.41%)	2.00% <0.00%> (ø%)
...perators/observable/ObservableMergeWithSingle.java	99.05% <0.00%> (-0.95%)	2.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableReplay.java	98.92% <0.00%> (-0.86%)	21.00% <0.00%> (ø%)
.../operators/observable/ObservableFlatMapSingle.java	96.03% <0.00%> (-0.80%)	2.00% <0.00%> (ø%)
... and 10 more

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