2.x JavaDocs: Remove unnecessary 's' from ConnectableObservable

[akarnokd]

Remove the unnecessary 's' from the JavaDocs of ConnectableObservable.autoConnect.

[codecov]

Codecov Report

Merging #6220 into 2.x will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                2.x   #6220      +/-   ##
===========================================
- Coverage     98.22%   98.2%   -0.03%     
- Complexity     6199    6202       +3     
===========================================
  Files           667     667              
  Lines         44888   44888              
  Branches       6218    6218              
===========================================
- Hits          44092   44083       -9     
- Misses          252     258       +6     
- Partials        544     547       +3

Impacted Files	Coverage Δ	Complexity Δ
...o/reactivex/observables/ConnectableObservable.java	100% <ø> (ø)	12 <0> (ø)	⬇️
...ernal/operators/flowable/FlowableFromIterable.java	94.11% <0%> (-3.21%)	5% <0%> (ø)
...ava/io/reactivex/processors/BehaviorProcessor.java	95.96% <0%> (-3.14%)	59% <0%> (-1%)
...rnal/operators/flowable/FlowableFlatMapSingle.java	92.93% <0%> (-2.72%)	2% <0%> (ø)
...rnal/operators/observable/ObservableSwitchMap.java	93.61% <0%> (-2.66%)	3% <0%> (ø)
...rnal/operators/flowable/FlowableSkipLastTimed.java	95.91% <0%> (-2.05%)	2% <0%> (ø)
.../operators/mixed/FlowableSwitchMapCompletable.java	98.94% <0%> (-1.06%)	2% <0%> (ø)
...operators/observable/ObservableMergeWithMaybe.java	99.1% <0%> (-0.9%)	2% <0%> (ø)
.../operators/maybe/MaybeFlatMapIterableFlowable.java	97.54% <0%> (-0.82%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	94.89% <0%> (-0.73%)	2% <0%> (ø)
... and 23 more

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