Change single quotes to double in example in docs
Change single quotes to double in example in docs

scrapy/scrapy,pablohoffman/scrapy,elacuesta/scrapy,starrify/scrapy,pawelmhm/scrapy,dangra/scrapy,scrapy/scrapy,elacuesta/scrapy,pablohoffman/scrapy,dangra/scrapy,pablohoffman/scrapy,starrify/scrapy,pawelmhm/scrapy,scrapy/scrapy,elacuesta/scrapy,starrify/scrapy,pawelmhm/scrapy,dangra/scrapy