Fix small error in TupleUtils asciidoc

[nicolasgavalda]

This fixes a small error in reactor-extra's TupleUtils doc.

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[codecov-commenter]

Codecov Report

Merging #2201 into 3.3.x will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##              3.3.x    #2201      +/-   ##
============================================
+ Coverage     82.19%   82.22%   +0.03%     
- Complexity     4134     4136       +2     
============================================
  Files           380      380              
  Lines         31447    31450       +3     
  Branches       5844     5844              
============================================
+ Hits          25848    25860      +12     
+ Misses         4039     4034       -5     
+ Partials       1560     1556       -4     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/reactor/core/publisher/ParallelFlux.java	92.77% <ø> (ø)	98.00 <0.00> (ø)
...ore/src/main/java/reactor/core/publisher/Flux.java	96.02% <100.00%> (ø)	529.00 <1.00> (ø)
...src/main/java/reactor/core/publisher/MonoNext.java	87.17% <0.00%> (-2.57%)	2.00% <0.00%> (ø%)
...in/java/reactor/core/publisher/FluxWindowWhen.java	84.13% <0.00%> (-1.45%)	2.00% <0.00%> (ø%)
...eactor/core/publisher/ParallelMergeSequential.java	84.97% <0.00%> (-0.52%)	7.00% <0.00%> (ø%)
...c/main/java/reactor/core/publisher/FluxReplay.java	84.83% <0.00%> (-0.15%)	29.00% <0.00%> (ø%)
...ore/src/main/java/reactor/core/publisher/Mono.java	88.81% <0.00%> (+0.07%)	277.00% <0.00%> (+2.00%)
...ain/java/reactor/core/publisher/FluxConcatMap.java	90.83% <0.00%> (+0.55%)	7.00% <0.00%> (ø%)
...rc/main/java/reactor/core/publisher/Operators.java	82.23% <0.00%> (+1.15%)	137.00% <0.00%> (ø%)
...main/java/reactor/core/publisher/FluxGenerate.java	85.27% <0.00%> (+2.45%)	7.00% <0.00%> (ø%)

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[ericbottard]

Merging in 3.3.x.

Thanks for your contribution @nicolasgavalda !

[reactorbot]

@ericbottard this PR seems to have been merged on a maintenance branch, please ensure the change is merge-forwarded to intermediate maintenance branches and up to master 🙇