Add comment to query_cache method
Add comment to query_cache method

Zhomart/mongoid,Azzurrio/mongoid,rpocklin/mongoid,wuboy0307/mongoid,rinmu/mongoid,eljojo/mongoid,mongoid/mongoid,herimedia/mongoid,amw/mongoid,sideci-sample/sideci-sample-mongoid,canvas-drw/mongoid,joshsoftware/mongoid,johnny-miyake/mongoid,trmmy/mongoid,jonhyman/mongoid,jbrien/mongoid,wuboy0307/mongoid,simi/mongoid,jonhyman/mongoid,mongodb/mongoid,kay-kim/mongoid,glebtv/mongoid,jbrien/mongoid,zenjoy/mongoid,amw/mongoid,arnkorty/mongoid,narutosanjiv/mongoid,infiverve/mongoid,glebtv/mongoid,hashrocketeer/mongoid,mongodb/mongoid,zBMNForks/mongoid,zenjoy/mongoid,sideci-sample/sideci-sample-mongoid,itbakery/mongoid,cao7113/mongoid,johnny-miyake/mongoid,Sharevari-Inc/mongoid,bjori/mongoid,mongodb/mongoid,mysociety/mongoid,codedogfish/mongoid,Sharevari-Inc/mongoid,rafaelgaspar/mongoid,hashrocketeer/mongoid,trmmy/mongoid,rafaelgaspar/mongoid,tzar/mongoid,nviennot/mongoid,bencrouse/mongoid,kayakyakr/mongoid,zBMNForks/mongoid,matbox/mongoid,zaithottakath/mongoid,kcdragon/mongoid,drobune/mongoid,kay-kim/mongoid,infiverve/mongoid,imomoisoft/mongoid,cao7113/mongoid,rpocklin/mongoid,arnkorty/mongoid,zaithottakath/mongoid,herimedia/mongoid,canvas-drw/mongoid,stnguyen/mongoid,subhashb/mongoid,Welovroi/mongoid,joshsoftware/mongoid,kayakyakr/mongoid,codedogfish/mongoid,Zhomart/mongoid,uniiverse/mongoid,estolfo/mongoid,eljojo/mongoid,mysociety/mongoid,Welovroi/mongoid,matbox/mongoid,bjori/mongoid,karmakaze/mongoid,imomoisoft/mongoid,narutosanjiv/mongoid,estolfo/mongoid,bencrouse/mongoid,mongoid/mongoid,simi/mongoid,nusco/mongoid,karmakaze/mongoid,itbakery/mongoid,nicolasblanco/mongoid,stnguyen/mongoid,rinmu/mongoid,nusco/mongoid,sivagollapalli/mongoid,tzar/mongoid,Azzurrio/mongoid,uniiverse/mongoid,kcdragon/mongoid,sivagollapalli/mongoid,nviennot/mongoid,drobune/mongoid,subhashb/mongoid