[skip ci][docs] Fix typo in cache doc
[skip ci][docs] Fix typo in cache doc


Probably the most important commit ever :)
3ofcoins/chef-omnibus,intfrr/omnibus,mattray/omnibus,chef/omnibus,sh9189/omnibus,chef/omnibus,ashhher3/omnibus,jamesn/omnibus,szechyjs/omnibus,DataDog/omnibus-ruby,DataDog/omnibus-ruby,rhass/omnibus,rapid7/omnibus,higanworks/omnibus,Scalr/omnibus,rapid7/omnibus,sh9189/omnibus,DataDog/omnibus-ruby,hugosato/omnibus,adamleff/omnibus,strangelittlemonkey/omnibus,mattray/omnibus,jamesn/omnibus,hugosato/omnibus,pskrz/omnibus,Altiscale/omnibus,sh9189/omnibus,pskrz/omnibus,strangelittlemonkey/omnibus,higanworks/omnibus,ashhher3/omnibus,jamesn/omnibus,rapid7/omnibus,szechyjs/omnibus,mattray/omnibus,szechyjs/omnibus,lvfeng1130/omnibus,hugosato/omnibus,higanworks/omnibus,rhass/omnibus,adamleff/omnibus,intfrr/omnibus,chef/omnibus,adamleff/omnibus,3ofcoins/chef-omnibus,3ofcoins/chef-omnibus,intfrr/omnibus,rhass/omnibus,Scalr/omnibus,Scalr/omnibus,ashhher3/omnibus,pskrz/omnibus,lvfeng1130/omnibus,strangelittlemonkey/omnibus,lvfeng1130/omnibus,Altiscale/omnibus,Altiscale/omnibus