2.x: Change ObservableSource.defer to Observable.defer in Observable.scan() documentation.

[vanniktech]

• changes ObservableSource.defer to Observable.defer()

[codecov]

Codecov Report

Merging #5306 into 2.x will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5306      +/-   ##
============================================
- Coverage     96.09%   96.08%   -0.02%     
+ Complexity     5781     5780       -1     
============================================
  Files           630      630              
  Lines         41148    41148              
  Branches       5714     5714              
============================================
- Hits          39543    39537       -6     
- Misses          636      641       +5     
- Partials        969      970       +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Observable.java	100% <ø> (ø)	506 <0> (ø)	⬇️
...ternal/operators/flowable/FlowableSampleTimed.java	88.23% <0%> (-8.83%)	3% <0%> (ø)
...al/operators/observable/ObservableSampleTimed.java	90% <0%> (-6.67%)	3% <0%> (ø)
...ava/io/reactivex/processors/BehaviorProcessor.java	87.61% <0%> (-4.87%)	61% <0%> (ø)
...ex/internal/operators/maybe/MaybeTimeoutMaybe.java	94.11% <0%> (-4.42%)	2% <0%> (ø)
...reactivex/internal/operators/single/SingleAmb.java	96.36% <0%> (-3.64%)	9% <0%> (-1%)
...vex/internal/operators/flowable/FlowableTimer.java	92.85% <0%> (-3.58%)	2% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	90.35% <0%> (-3.51%)	9% <0%> (-1%)
.../internal/operators/flowable/FlowableInterval.java	93.33% <0%> (-3.34%)	2% <0%> (ø)
...activex/internal/operators/single/SingleCache.java	97.05% <0%> (-2.95%)	23% <0%> (-1%)
... and 45 more

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