Update examples/buffer.html
Update examples/buffer.html

fix buffer example
Geode/jsts,weftio/jsts,kolosov-sergey/jsts,nachoalthabe/cluster_poligonal,kolosov-sergey/jsts,mikeatlas/jsts,mikeatlas/jsts,Septima/jsts,Geode/jsts,weftio/jsts,weftio/jsts,Geode/jsts,Septima/jsts,Septima/jsts,yeyan/jsts,kolosov-sergey/jsts,yeyan/jsts,mikeatlas/jsts