fixed few small typos in docs/web_reference.rst
fixed few small typos in docs/web_reference.rst

alex-eri/aiohttp-1,esaezgil/aiohttp,vaskalas/aiohttp,esaezgil/aiohttp,rutsky/aiohttp,singulared/aiohttp,elastic-coders/aiohttp,elastic-coders/aiohttp,Eyepea/aiohttp,moden-py/aiohttp,juliatem/aiohttp,alex-eri/aiohttp-1,vaskalas/aiohttp,singulared/aiohttp,moden-py/aiohttp,AraHaanOrg/aiohttp,esaezgil/aiohttp,KeepSafe/aiohttp,mind1master/aiohttp,vaskalas/aiohttp,arthurdarcet/aiohttp,panda73111/aiohttp,mind1master/aiohttp,KeepSafe/aiohttp,jashandeep-sohi/aiohttp,z2v/aiohttp,AraHaanOrg/aiohttp,pfreixes/aiohttp,arthurdarcet/aiohttp,panda73111/aiohttp,pfreixes/aiohttp,moden-py/aiohttp,jashandeep-sohi/aiohttp,rutsky/aiohttp,jettify/aiohttp,hellysmile/aiohttp,playpauseandstop/aiohttp,mind1master/aiohttp,singulared/aiohttp,KeepSafe/aiohttp,panda73111/aiohttp,juliatem/aiohttp,jashandeep-sohi/aiohttp,elastic-coders/aiohttp,rutsky/aiohttp,z2v/aiohttp,z2v/aiohttp,jettify/aiohttp,hellysmile/aiohttp,jettify/aiohttp,alex-eri/aiohttp-1,arthurdarcet/aiohttp