Document more multidict methods
Document more multidict methods

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