connection: new documentation for error handling
connection: new documentation for error handling

jagleeso/libmpdclient,sl0th/libmpdclient,cmende/libmpdclient,OpenInkpot-archive/iplinux-libmpdclient,jwise/libmpdclient,sl0th/libmpdclient,jagleeso/libmpdclient,jagleeso/libmpdclient,psych0tik/libmpdclient2,yusiwen/libmpdclient,OpenInkpot-archive/iplinux-libmpdclient,yusiwen/libmpdclient,jwise/libmpdclient,yusiwen/libmpdclient,cmende/libmpdclient,psych0tik/libmpdclient2,jwise/libmpdclient,sl0th/libmpdclient,cmende/libmpdclient