[jira] [Created] (HUDI-2775) Add documentation for external configuration support

[Wenning Ding (Jira)]

Wenning Ding created HUDI-2775:
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             Summary: Add documentation for external configuration support
                 Key: HUDI-2775
                 URL: https://issues.apache.org/jira/browse/HUDI-2775
             Project: Apache Hudi
          Issue Type: Sub-task
            Reporter: Wenning Ding


We support external configuration in this pr: 
[https://github.com/apache/hudi/pull/3486,] but we need more documentation to 
let the customers know how to use it



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