2.x: fix javadoc for ConnectableFlowable and others

[davidmoten]

Some javadoc fixes for ConnectableFlowable, GroupedFlowable and FlowableAutoConnect

[codecov]

Codecov Report

Merging #5738 into 2.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x    #5738   +/-   ##
=========================================
  Coverage     96.27%   96.27%           
+ Complexity     5828     5827    -1     
=========================================
  Files           634      634           
  Lines         41615    41615           
  Branches       5761     5761           
=========================================
  Hits          40063    40063           
+ Misses          618      617    -1     
- Partials        934      935    +1

Impacted Files	Coverage Δ	Complexity Δ
...n/java/io/reactivex/flowables/GroupedFlowable.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...va/io/reactivex/flowables/ConnectableFlowable.java	100% <ø> (ø)	7 <0> (ø)	⬇️
...ternal/operators/flowable/FlowableAutoConnect.java	100% <ø> (ø)	3 <0> (ø)	⬇️
.../operators/completable/CompletableConcatArray.java	93.75% <0%> (-6.25%)	2% <0%> (ø)
...in/java/io/reactivex/subjects/BehaviorSubject.java	86.97% <0%> (-5.73%)	57% <0%> (ø)
...rnal/operators/flowable/FlowableSkipLastTimed.java	95.91% <0%> (-2.05%)	2% <0%> (ø)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...ex/internal/subscribers/InnerQueuedSubscriber.java	96.07% <0%> (-1.97%)	18% <0%> (-1%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	91.78% <0%> (-1.94%)	2% <0%> (ø)
.../io/reactivex/disposables/CompositeDisposable.java	97.24% <0%> (-1.84%)	39% <0%> (-1%)
... and 21 more

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