fix fb lua listener sample code
fix fb lua listener sample code

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