[Backport 2.x] Fixed typo in DEVELOPER_GUIDE.md.

[opensearch-trigger-bot]

Backport 7526f86 from #12051.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 4b1a297

Incompatible components

Incompatible components: [https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/cross-cluster-replication.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/sql.git]

[github-actions]

❕ Gradle check result for 4b1a297: UNSTABLE

• TEST FAILURES:

      2 org.opensearch.search.SearchWeightedRoutingIT.testShardRoutingWithNetworkDisruption_FailOpenEnabled
      1 org.opensearch.remotestore.RemoteIndexPrimaryRelocationIT.testPrimaryRelocationWhileIndexing
      1 org.opensearch.cluster.coordination.AwarenessAttributeDecommissionIT.testConcurrentDecommissionAction
      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=pit/10_basic/Delete all}

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9da5835) 71.06% compared to head (4b1a297) 71.17%.
Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #12098      +/-   ##
============================================
+ Coverage     71.06%   71.17%   +0.11%     
- Complexity    59390    59454      +64     
============================================
  Files          4891     4891              
  Lines        279988   279988              
  Branches      41072    41072              
============================================
+ Hits         198969   199279     +310     
+ Misses        64119    63820     -299     
+ Partials      16900    16889      -11     

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