[jira] [Created] (ARROW-16997) [Doc][Dev] Update arrow/dev README

[Alenka Frim (Jira)]

Alenka Frim created ARROW-16997:
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             Summary: [Doc][Dev] Update arrow/dev README
                 Key: ARROW-16997
                 URL: https://issues.apache.org/jira/browse/ARROW-16997
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Developer Tools, Documentation
            Reporter: Alenka Frim
            Assignee: Alenka Frim


Update the output for merge PR readme:

https://github.com/apache/arrow/tree/master/dev#how-to-merge-a-pull-request



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