Documentation: fix a typo in the storage documentation
Documentation: fix a typo in the storage documentation

holgerkoser/dex,xeonx/dex,chub/coreos-dex,xeonx/dex,chub/coreos-dex,wolfeidau/dex,Calpicow/dex,rithujohn191/dex,ericchiang/dex,Calpicow/dex,chub/coreos-dex,Calpicow/dex,circleci/dex,coreos/dex,holgerkoser/dex,jwmaag/dex,wolfeidau/dex,coreos/dex,wolfeidau/dex,coreos/dex,rithujohn191/dex,jwmaag/dex,ericchiang/dex,ericchiang/dex,holgerkoser/dex,circleci/dex,circleci/dex,rithujohn191/dex,jwmaag/dex,xeonx/dex