Fix typo in web client quickstart url parsing doc
Fix typo in web client quickstart url parsing doc

PR #3101 by @antonmyronyuk

change == to = while assigment expected url string ()
KeepSafe/aiohttp,KeepSafe/aiohttp,rutsky/aiohttp,arthurdarcet/aiohttp,arthurdarcet/aiohttp,rutsky/aiohttp,rutsky/aiohttp,arthurdarcet/aiohttp,KeepSafe/aiohttp