connection: document the environment variables MPD_{HOST,PORT}
connection: document the environment variables MPD_{HOST,PORT}

yusiwen/libmpdclient,psych0tik/libmpdclient2,cmende/libmpdclient,jwise/libmpdclient,cmende/libmpdclient,sl0th/libmpdclient,jagleeso/libmpdclient,jwise/libmpdclient,jagleeso/libmpdclient,cmende/libmpdclient,jagleeso/libmpdclient,jwise/libmpdclient,psych0tik/libmpdclient2,yusiwen/libmpdclient,sl0th/libmpdclient,sl0th/libmpdclient,yusiwen/libmpdclient