internal: added API documentation to struct mpd_connection
internal: added API documentation to struct mpd_connection

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