docs: clarify speed comparison chart (#1576)
docs: clarify speed comparison chart (#1576)


tivac/mithril.js,barneycarroll/mithril.js,lhorie/mithril.js,barneycarroll/mithril.js,lhorie/mithril.js,impinball/mithril.js,pygy/mithril.js,MithrilJS/mithril.js,pygy/mithril.js,MithrilJS/mithril.js,impinball/mithril.js,tivac/mithril.js