Fix broken markdown

[ojh102]

Fix broken mark down and change the link to CONTRIBUTING

[codecov]

Codecov Report

Merging #6273 into 2.x will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #6273      +/-   ##
============================================
- Coverage     98.25%   98.18%   -0.08%     
- Complexity     6206     6208       +2     
============================================
  Files           667      667              
  Lines         44905    44905              
  Branches       6228     6228              
============================================
- Hits          44121    44088      -33     
- Misses          239      259      +20     
- Partials        545      558      +13

Impacted Files	Coverage Δ	Complexity Δ
...l/operators/observable/ObservableFlatMapMaybe.java	84.96% <0%> (-11.12%)	2% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	94.69% <0%> (-3.54%)	11% <0%> (ø)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	90.82% <0%> (-2.9%)	2% <0%> (ø)
...ernal/operators/flowable/FlowableFromIterable.java	95.18% <0%> (-2.14%)	5% <0%> (ø)
...x/internal/operators/flowable/FlowablePublish.java	96.59% <0%> (-2.13%)	11% <0%> (ø)
...ava/io/reactivex/processors/BehaviorProcessor.java	96.86% <0%> (-1.35%)	60% <0%> (+1%)
...ternal/operators/completable/CompletableMerge.java	96.42% <0%> (-1.2%)	2% <0%> (ø)
...perators/mixed/ObservableSwitchMapCompletable.java	98.94% <0%> (-1.06%)	3% <0%> (ø)
...ex/internal/operators/flowable/FlowableReplay.java	94.26% <0%> (-0.85%)	20% <0%> (ø)
...perators/single/SingleFlatMapIterableFlowable.java	97.5% <0%> (-0.84%)	2% <0%> (ø)
... and 17 more

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