Fix return type in the example

[antegocanva]

Description

Fix the example about a flat map

Motivation and Context

I want to live in a better world.

Testing

Tested by looking into it.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

Yes.

License

• I confirm that this pull request can be released under the Apache 2 license

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information

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[codecov-commenter]

Codecov Report

Merging #1973 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1973   +/-   ##
=========================================
  Coverage     76.64%   76.65%           
  Complexity      225      225           
=========================================
  Files          1112     1112           
  Lines         33653    33653           
  Branches       2621     2621           
=========================================
+ Hits          25794    25796    +2     
  Misses         6580     6580           
+ Partials       1279     1277    -2     

Flag	Coverage Δ	Complexity Δ
#unittests	76.65% <ø> (+<0.01%)	225.00 <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...ine/stages/ApiCallAttemptTimeoutTrackingStage.java	93.10% <0.00%> (-6.90%)	0.00% <0.00%> (ø%)
...ssdk/core/internal/async/FileAsyncRequestBody.java	83.80% <0.00%> (-0.96%)	0.00% <0.00%> (ø%)
...ty/internal/IdleConnectionCountingChannelPool.java	87.80% <0.00%> (+2.43%)	0.00% <0.00%> (ø%)
...nio/netty/internal/OldConnectionReaperHandler.java	90.90% <0.00%> (+9.09%)	0.00% <0.00%> (ø%)

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[millems]

Thanks for your contribution!