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

mudbugmedia/subversion,opscode-cookbooks/subversion,imon214/chef-subversion,Youscribe/subversion,opscode-cookbooks/subversion,jtimberman/subversion,cookbooks/oc-subversion,khuongdp/subversion,openitdotcom/chef-subversion,zhila/subversion,finnlabs/subversion,chef-cookbooks/subversion,mre/subversion,tknerr/cookbooks-subversion,mudbugmedia/subversion,chef-cookbooks/subversion