Update doc for ClientSession
Update doc for ClientSession

singulared/aiohttp,arthurdarcet/aiohttp,sterwill/aiohttp,Eyepea/aiohttp,juliatem/aiohttp,vaskalas/aiohttp,elastic-coders/aiohttp,singulared/aiohttp,AlexLisovoy/aiohttp,morgan-del/aiohttp,juliatem/aiohttp,alex-eri/aiohttp-1,esaezgil/aiohttp,andyaguiar/aiohttp,hellysmile/aiohttp,jettify/aiohttp,jashandeep-sohi/aiohttp,alexsdutton/aiohttp,decentfox/aiohttp,elastic-coders/aiohttp,esaezgil/aiohttp,Insoleet/aiohttp,iksteen/aiohttp,panda73111/aiohttp,rutsky/aiohttp,moden-py/aiohttp,avanov/aiohttp,vaskalas/aiohttp,jettify/aiohttp,moden-py/aiohttp,z2v/aiohttp,jashandeep-sohi/aiohttp,flying-sheep/aiohttp,pathcl/aiohttp,AlexLisovoy/aiohttp,decentfox/aiohttp,KeepSafe/aiohttp,arthurdarcet/aiohttp,decentfox/aiohttp,AraHaanOrg/aiohttp,jojurajan/aiohttp,singulared/aiohttp,noodle-learns-programming/aiohttp,mind1master/aiohttp,Srogozins/aiohttp,KeepSafe/aiohttp,z2v/aiohttp,vaskalas/aiohttp,rutsky/aiohttp,pfreixes/aiohttp,jojurajan/aiohttp,danielnelson/aiohttp,jashandeep-sohi/aiohttp,mind1master/aiohttp,playpauseandstop/aiohttp,alex-eri/aiohttp-1,vedun/aiohttp,KeepSafe/aiohttp,esaezgil/aiohttp,vasylbo/aiohttp,moden-py/aiohttp,alex-eri/aiohttp-1,elastic-coders/aiohttp,AraHaanOrg/aiohttp,z2v/aiohttp,mind1master/aiohttp,alunduil/aiohttp,hellysmile/aiohttp,iksteen/aiohttp,panda73111/aiohttp,alexsdutton/aiohttp,jettify/aiohttp,pfreixes/aiohttp,rutsky/aiohttp,panda73111/aiohttp,arthurdarcet/aiohttp