Update docs/topics/settings.rst
Update docs/topics/settings.rst

added suggestion

Co-authored-by: Adrián Chaves <a1b909ec1cc11cce40c28d3640eab600e582f833@chaves.io>
pablohoffman/scrapy,pawelmhm/scrapy,pawelmhm/scrapy,elacuesta/scrapy,pablohoffman/scrapy,elacuesta/scrapy,elacuesta/scrapy,scrapy/scrapy,scrapy/scrapy,pablohoffman/scrapy,pawelmhm/scrapy,scrapy/scrapy