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

h4ck3rm1k3/postgresql,sous-chefs/postgresql,patcon/postgresql,hw-cookbooks/postgresql,jayceeb/chef-postgresql,cookbooks/oc-postgresql,alfert/camp-cookbooks-postgresql,coroutine/chef-postgresql,yakara-ltd/postgresql,rastasheep/postgresql,hw-cookbooks/postgresql,cookbooks/hw-postgresql,conjurinc/postgresql,inetsys/postgresql,GitBytes/postgresql,thomas88/postgresql,ozzyogkush/postgresql,eheydrick/postgresql,clearstorydata/chef-postgresql,bradmontgomery/chef-postgresql,jharveysmith/postgresql,conjurinc/postgresql,chiemi627/postgresql,wearefuturegov/postgresql,h4ck3rm1k3/postgresql,pronix/postgresql,DonorsChoose/chef-postgresql,dwashko/chef-postgresql,Lispython/pg_cluster-cookbook,clearstorydata/chef-postgresql,livepy/postgresql,gsaslis/postgresql,dguenms/postgresql,DonorsChoose/chef-postgresql,clearstorydata/chef-postgresql,rastasheep/postgresql,yakara-ltd/postgresql,dwashko/chef-postgresql,jayceeb/chef-postgresql,livepy/postgresql,chiemi627/postgresql,CloCkWeRX/postgresql,wearefuturegov/postgresql,eheydrick/postgresql,inetsys/postgresql,getsentry/postgresql,ozzyogkush/postgresql,gsaslis/postgresql,dguenms/postgresql,sous-chefs/postgresql,cookbooks/mc-postgresql,imtapps-cookbooks/postgresql,GitBytes/postgresql,Lispython/pg_cluster-cookbook,NREL-cookbooks/postgresql,NREL-cookbooks/postgresql,Unholster/postgresql,bradmontgomery/chef-postgresql,patcon/postgresql,Unholster/postgresql,cookbooks/hw-postgresql,pronix/postgresql