Improve how extra Item API members are introduced in the documentation
Improve how extra Item API members are introduced in the documentation

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