[doc] Fix Gradle typo in getting started section

[echooymxq]

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[codecov-io]

Codecov Report

Merging #2001 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2001      +/-   ##
============================================
- Coverage     81.73%   81.72%   -0.01%     
- Complexity     4014     4015       +1     
============================================
  Files           375      375              
  Lines         30926    30926              
  Branches       5808     5808              
============================================
- Hits          25277    25274       -3     
- Misses         4052     4059       +7     
+ Partials       1597     1593       -4

Impacted Files	Coverage Δ	Complexity Δ
...in/java/reactor/core/publisher/FluxWindowWhen.java	79.8% <0%> (-6.25%)	2% <0%> (ø)
...main/java/reactor/core/publisher/FluxIterable.java	77.14% <0%> (-0.72%)	12% <0%> (ø)
...eactor/core/publisher/ParallelMergeSequential.java	84.97% <0%> (-0.52%)	7% <0%> (ø)
...eactor/core/scheduler/BoundedElasticScheduler.java	83.43% <0%> (-0.3%)	39% <0%> (ø)
...ain/java/reactor/core/publisher/FluxPublishOn.java	86.57% <0%> (+0.2%)	6% <0%> (ø)	⬇️
...c/main/java/reactor/core/publisher/FluxReplay.java	84.29% <0%> (+0.45%)	28% <0%> (+1%)	⬆️
...ain/java/reactor/core/publisher/FluxConcatMap.java	90% <0%> (+0.55%)	7% <0%> (ø)	⬇️
...java/reactor/core/publisher/MonoSequenceEqual.java	85.97% <0%> (+0.6%)	3% <0%> (ø)	⬇️
.../java/reactor/core/publisher/BlockingIterable.java	79.38% <0%> (+1.03%)	7% <0%> (ø)	⬇️
...va/reactor/core/publisher/ParallelMergeReduce.java	72.95% <0%> (+3.27%)	3% <0%> (ø)	⬇️
... and 1 more

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[simonbasle]

Thanks for the PR 👍

[simonbasle]

Thanks for the PR 👍