2.x: Fix typo in error message.

[ragunathjawahar]

When BaseTestConsumer receives fewer items than expected, the error shown has a typo. Replaced Fever with Fewer.

[akarnokd]

You are supposed to replace the intro text with the description of your PR...

[ragunathjawahar]

Done, thank you for the info.

[codecov]

Codecov Report

Merging #5354 into 2.x will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##               2.x    #5354      +/-   ##
===========================================
- Coverage     96.2%   96.19%   -0.02%     
+ Complexity    5790     5782       -8     
===========================================
  Files          630      630              
  Lines        41162    41162              
  Branches      5721     5721              
===========================================
- Hits         39601    39596       -5     
- Misses         607      616       +9     
+ Partials       954      950       -4

Impacted Files	Coverage Δ	Complexity Δ
.../java/io/reactivex/observers/BaseTestConsumer.java	99.6% <100%> (ø)	108 <0> (ø)	⬇️
...in/java/io/reactivex/subjects/BehaviorSubject.java	85.93% <0%> (-5.73%)	56% <0%> (ø)
...a/io/reactivex/internal/util/QueueDrainHelper.java	60.28% <0%> (-4.26%)	32% <0%> (-3%)
...internal/operators/completable/CompletableAmb.java	94.91% <0%> (-3.39%)	10% <0%> (-1%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	94.2% <0%> (-3.39%)	2% <0%> (ø)
...activex/internal/operators/single/SingleCache.java	97.05% <0%> (-2.95%)	23% <0%> (-1%)
...rnal/operators/flowable/FlowableTakeLastTimed.java	96.29% <0%> (-2.78%)	2% <0%> (ø)
...activex/internal/observers/QueueDrainObserver.java	61.53% <0%> (-2.57%)	12% <0%> (-1%)
...perators/single/SingleFlatMapIterableFlowable.java	95.83% <0%> (-2.5%)	2% <0%> (ø)
...main/java/io/reactivex/subjects/SingleSubject.java	97.61% <0%> (-2.39%)	39% <0%> (-1%)
... and 41 more

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