Small documentation fixes.
Small documentation fixes.

scrapy/scrapy,pawelmhm/scrapy,elacuesta/scrapy,elacuesta/scrapy,pablohoffman/scrapy,pablohoffman/scrapy,pawelmhm/scrapy,pawelmhm/scrapy,elacuesta/scrapy,scrapy/scrapy,pablohoffman/scrapy,scrapy/scrapy