3.x: Apply the Javadoc format cleanup to Disposable.html

[akarnokd]

Add Disposable.html to the javadoc_cleanup.gradle program to fix unnecessary newlines and duplicate annotations in the docs.

[codecov]

Codecov Report

Merging #7393 (6508897) into 3.x (97f1702) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #7393      +/-   ##
============================================
+ Coverage     99.53%   99.56%   +0.03%     
- Complexity     6780     6782       +2     
============================================
  Files           751      751              
  Lines         47482    47482              
  Branches       6378     6378              
============================================
+ Hits          47260    47275      +15     
+ Misses          101       94       -7     
+ Partials        121      113       -8     

Impacted Files	Coverage Δ
...nternal/operators/observable/ObservableCreate.java	95.72% <0.00%> (-4.28%)	⬇️
...ernal/operators/flowable/FlowableFlatMapMaybe.java	95.33% <0.00%> (-2.08%)	⬇️
...a3/internal/operators/flowable/FlowableReplay.java	98.92% <0.00%> (-0.65%)	⬇️
...a/io/reactivex/rxjava3/subjects/ReplaySubject.java	99.16% <0.00%> (ø)
...ternal/operators/completable/CompletableMerge.java	98.64% <0.00%> (ø)
...l/operators/observable/ObservableFlatMapMaybe.java	97.88% <0.00%> (ø)
...perators/single/SingleFlatMapIterableFlowable.java	100.00% <0.00%> (+0.83%)	⬆️
...a3/internal/operators/flowable/FlowableCreate.java	98.70% <0.00%> (+0.97%)	⬆️
...ternal/operators/observable/ObservableGroupBy.java	100.00% <0.00%> (+1.09%)	⬆️
...nternal/operators/observable/ObservableWindow.java	100.00% <0.00%> (+1.78%)	⬆️
... and 5 more

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