add example usage to api_reference generator
add example usage to api_reference generator

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