update zh-cn/release-notes/Readme.md.

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update zh-cn/release-notes/Readme.md.
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 # OpenHarmony Release Notes
+## OpenHarmony 3.x Releases
 [OpenHarmony v3.0 LTS (2021-09-30)](OpenHarmony-v3.0-LTS.md)

 ## OpenHarmony 2.x Releases