[COOK-1087] Update the CONTRIBUTING file to fix a minor typo
[COOK-1087] Update the CONTRIBUTING file to fix a minor typo

chef-cookbooks/keepalived,jtimberman/keepalived,Shopify/chef-keepalived,geidies/keepalived,x-ion-de/keepalived,nathwill/keepalived,cookbooks/oc-keepalived,cookbooks/hw-keepalived,diegobill/keepalived,wadtech/keepalived,diegobill/keepalived,x-ion-de/keepalived,opscode-cookbooks/keepalived,dnbert/keepalived,opscode-cookbooks/keepalived,Shopify/chef-keepalived,Youscribe/keepalived,meineerde-cookbooks/keepalived,TAMUArch/keepalived