Fix example to use create_server() instead of start_serving().
Fix example to use create_server() instead of start_serving().

fallen/asyncio,1st1/asyncio,Martiusweb/asyncio,jashandeep-sohi/asyncio,manipopopo/asyncio,ajdavis/asyncio,gvanrossum/asyncio,gsb-eng/asyncio,gsb-eng/asyncio,fallen/asyncio,haypo/trollius,vxgmichel/asyncio,gsb-eng/asyncio,jashandeep-sohi/asyncio,vxgmichel/asyncio,Martiusweb/asyncio,vxgmichel/asyncio,1st1/asyncio,jashandeep-sohi/asyncio,manipopopo/asyncio,ajdavis/asyncio,1st1/asyncio,gvanrossum/asyncio,Martiusweb/asyncio,haypo/trollius,haypo/trollius,fallen/asyncio,gvanrossum/asyncio,ajdavis/asyncio,manipopopo/asyncio