update release note for 2.3.
update release note for 2.3.

sdkbox-doc/en,yinjimmy/en,sdkbox-staging/en,sdkbox-doc/en,yinjimmy/en,sdkbox-staging/en,yinjimmy/en,sdkbox-staging/en,sdkbox-staging/en,sdkbox-doc/en,sdkbox-doc/en,yinjimmy/en