Add release 2.5 doc (#6760)
* update release note, test=document_fix * update README, test=document_fix * update overview, test=document_fix * update en doc, test=document_fix * add ocsort, test=document_fix
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* update release note, test=document_fix * update README, test=document_fix * update overview, test=document_fix * update en doc, test=document_fix * add ocsort, test=document_fix
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