Update Alphabetical-List-of-Observable-Operators.md

[khkong]

#6132
Invalid link edited.

[codecov]

Codecov Report

Merging #6497 into 2.x will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #6497      +/-   ##
============================================
- Coverage     98.27%   98.24%   -0.04%     
- Complexity     6292     6294       +2     
============================================
  Files           675      675              
  Lines         45163    45163              
  Branches       6244     6244              
============================================
- Hits          44386    44372      -14     
- Misses          241      246       +5     
- Partials        536      545       +9

Impacted Files	Coverage Δ	Complexity Δ
...ernal/operators/flowable/FlowableFlatMapMaybe.java	88.88% <0%> (-6.29%)	2% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	93.8% <0%> (-4.43%)	10% <0%> (-1%)
.../operators/observable/ObservableFlatMapSingle.java	89.55% <0%> (-2.24%)	2% <0%> (ø)
...nternal/operators/observable/ObservableWindow.java	98% <0%> (-2%)	3% <0%> (ø)
...java/io/reactivex/processors/UnicastProcessor.java	98.8% <0%> (-1.2%)	67% <0%> (-1%)
...ivex/internal/operators/maybe/MaybeMergeArray.java	96.62% <0%> (-1.13%)	6% <0%> (ø)
...perators/mixed/ObservableConcatMapCompletable.java	99.24% <0%> (-0.76%)	3% <0%> (ø)
...ternal/operators/observable/ObservableFlatMap.java	88.67% <0%> (-0.65%)	3% <0%> (ø)
...vex/internal/operators/parallel/ParallelRunOn.java	96.61% <0%> (-0.49%)	8% <0%> (ø)
...ternal/operators/flowable/FlowableWindowTimed.java	91.62% <0%> (-0.46%)	4% <0%> (ø)
... and 18 more

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