Update onMessage delegate method documentation for ccSelf
Update onMessage delegate method documentation for ccSelf

JeeLiu/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,JeeLiu/respoke-sdk-ios,Havi4/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,Havi4/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,respoke/respoke-sdk-ios,iosyoujian/respoke-sdk-ios,JeeLiu/respoke-sdk-ios,respoke/respoke-sdk-ios,Havi4/respoke-sdk-ios,respoke/respoke-sdk-ios,i-miss-you/respoke-sdk-ios,iosyoujian/respoke-sdk-ios