Update aad-starter's CHANGELOG.md. Make it easier to understand.

[chenrujun]

Update aad-starter's CHANGELOG.md. Make it easier to understand.

[chenrujun]

Hi, @yiliuTo , please help to review this PR.

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[yiliuTo]

LGTM

[chenrujun]

/check-enforcer override

[chenrujun]

/check-enforcer override