doc: update the link by the cloudberry code base dir changed

[yihong0618]

closes: #ISSUE_Number

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Change logs

the location for README bash had changed in upstream repo so this PR fix it right
@edespino @tuhaihe

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[github-actions]

Hiiii, @yihong0618 welcome!🎊 Thanks for taking the effort to make our project better! 🙌 Keep making such awesome contributions!

[tuhaihe]

@yihong0618 good catch! Thanks!