Fix typo in CONTRIBUTING.md

[0xnm]

What does this PR do?

This change fixes a typo in CONTRIBUTING.md file.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[xgouchet]

You can use --excludes "**/build/**" as I have a PR moving the generated files into the build folder, and I'm gonna change the shared config to ignore those folders anyway

[xgouchet]

This should not be needed after #1189 and ddsource#20537 are merged

[0xnm]

@xgouchet good to know! let's keep the part with typo fix then, I updated and renamed this PR.

[codecov-commenter]

Codecov Report

Merging #1188 (111bbde) into develop (b627277) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1188      +/-   ##
===========================================
+ Coverage    82.27%   82.30%   +0.03%     
===========================================
  Files          353      353              
  Lines        11793    11793              
  Branches      2006     2006              
===========================================
+ Hits          9702     9706       +4     
+ Misses        1477     1476       -1     
+ Partials       614      611       -3     

Impacted Files	Coverage Δ
.../src/main/java/com/datadog/opentracing/DDSpan.java	40.66% <0.00%> (-1.10%)	⬇️
...android/rum/internal/ndk/DatadogNdkCrashHandler.kt	87.19% <0.00%> (-0.49%)	⬇️
...rc/main/java/com/datadog/opentracing/DDTracer.java	55.65% <0.00%> (-0.42%)	⬇️
...android/v2/core/internal/DatadogContextProvider.kt	81.54% <0.00%> (ø)
...android/v2/core/internal/net/DataOkHttpUploader.kt	94.52% <0.00%> (ø)
...rsistence/file/batch/PlainBatchFileReaderWriter.kt	86.27% <0.00%> (ø)
...in/com/datadog/android/log/internal/LogsFeature.kt	88.71% <0.00%> (+1.61%)	⬆️
...ndroid/telemetry/internal/TelemetryEventHandler.kt	72.27% <0.00%> (+2.52%)	⬆️
...n/com/datadog/android/v2/core/SdkInternalLogger.kt	92.31% <0.00%> (+11.54%)	⬆️