2.x: Fix Observable.delay & Flowable.delay javadoc

[PhilGlass]

Error notifications can be delayed when using the overloads with a delayError parameter.

[codecov]

Codecov Report

Merging #5617 into 2.x will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                2.x   #5617      +/-   ##
===========================================
- Coverage     96.27%   96.2%   -0.08%     
+ Complexity     5844    5839       -5     
===========================================
  Files           632     632              
  Lines         41473   41473              
  Branches       5745    5745              
===========================================
- Hits          39929   39898      -31     
- Misses          617     628      +11     
- Partials        927     947      +20

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Flowable.java	100% <ø> (ø)	523 <0> (ø)	⬇️
src/main/java/io/reactivex/Observable.java	100% <ø> (ø)	506 <0> (ø)	⬇️
.../operators/flowable/FlowableBlockingSubscribe.java	91.89% <0%> (-5.41%)	9% <0%> (-1%)
...nternal/operators/observable/ObservableCreate.java	94.87% <0%> (-4.28%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	92.93% <0%> (-3.81%)	2% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	92.98% <0%> (-3.51%)	11% <0%> (ø)
.../io/reactivex/internal/schedulers/IoScheduler.java	89.24% <0%> (-3.23%)	9% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	92.75% <0%> (-2.18%)	2% <0%> (ø)
...internal/operators/completable/CompletableAmb.java	98.3% <0%> (-1.7%)	11% <0%> (ø)
...vex/internal/subscribers/QueueDrainSubscriber.java	50% <0%> (-1.57%)	15% <0%> (-1%)
... and 18 more

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