updated doc/architecture.svg with Canvas
updated doc/architecture.svg with Canvas

RebeccaWPerry/vispy,julienr/vispy,kkuunnddaannkk/vispy,jdreaver/vispy,jdreaver/vispy,dchilds7/Deysha-Star-Formation,sbtlaarzc/vispy,sh4wn/vispy,inclement/vispy,Eric89GXL/vispy,ghisvail/vispy,ghisvail/vispy,inclement/vispy,srinathv/vispy,bollu/vispy,michaelaye/vispy,Eric89GXL/vispy,julienr/vispy,kkuunnddaannkk/vispy,michaelaye/vispy,kkuunnddaannkk/vispy,jay3sh/vispy,QuLogic/vispy,bollu/vispy,hronoses/vispy,michaelaye/vispy,hronoses/vispy,inclement/vispy,sh4wn/vispy,srinathv/vispy,QuLogic/vispy,dchilds7/Deysha-Star-Formation,drufat/vispy,ghisvail/vispy,sbtlaarzc/vispy,julienr/vispy,srinathv/vispy,drufat/vispy,drufat/vispy,sh4wn/vispy,jay3sh/vispy,RebeccaWPerry/vispy,Eric89GXL/vispy,QuLogic/vispy,hronoses/vispy,jay3sh/vispy,dchilds7/Deysha-Star-Formation,jdreaver/vispy,RebeccaWPerry/vispy,bollu/vispy,sbtlaarzc/vispy