Restore license to correct text.

[JakeWharton]

This section is a template on how to apply the header and not something that actually should have been changed.

Refs #4980.

[codecov]

Codecov Report

Merging #5735 into 2.x will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5735      +/-   ##
============================================
+ Coverage     96.28%   96.32%   +0.04%     
- Complexity     5829     5831       +2     
============================================
  Files           634      634              
  Lines         41615    41615              
  Branches       5761     5761              
============================================
+ Hits          40067    40085      +18     
+ Misses          618      605      -13     
+ Partials        930      925       -5

Impacted Files	Coverage Δ	Complexity Δ
.../operators/completable/CompletableConcatArray.java	93.75% <0%> (-6.25%)	2% <0%> (ø)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
.../io/reactivex/disposables/CompositeDisposable.java	97.24% <0%> (-1.84%)	39% <0%> (-1%)
...internal/operators/completable/CompletableAmb.java	98.3% <0%> (-1.7%)	11% <0%> (ø)
...vex/internal/operators/flowable/FlowableCache.java	92.61% <0%> (-1.35%)	7% <0%> (ø)
...nal/operators/flowable/FlowableConcatMapEager.java	97.1% <0%> (-1.16%)	2% <0%> (ø)
...ernal/operators/flowable/FlowableFromIterable.java	94.11% <0%> (-1.07%)	5% <0%> (ø)
...vex/internal/operators/parallel/ParallelRunOn.java	96.44% <0%> (-1.02%)	6% <0%> (ø)
...nternal/operators/observable/ObservableCreate.java	98.29% <0%> (-0.86%)	2% <0%> (ø)
.../operators/observable/ObservableFlatMapSingle.java	94.77% <0%> (-0.75%)	2% <0%> (ø)
... and 16 more

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