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

yakara-ltd/ossec-cookbook,cookbooks/oc-ossec,DataDog/ossec-cookbook,Seedstars/ossec-cookbook,strataconsulting/ossec-cookbook,pkringle/ossec-cookbook,controlshift/ossec-cookbook,yakara-ltd/ossec-cookbook,yakara-ltd/ossec-cookbook,jonDowdle/ossec-cookbook,strataconsulting/ossec-cookbook,shortdudey123/ossec-cookbook,controlshift/ossec-cookbook,strataconsulting/ossec-cookbook,DataDog/ossec-cookbook,Seedstars/ossec-cookbook,pkringle/ossec-cookbook,pkringle/ossec-cookbook,jtimberman/ossec-cookbook,jonDowdle/ossec-cookbook,Seedstars/ossec-cookbook,jtimberman/ossec-cookbook,DataDog/ossec-cookbook,jtimberman/ossec-cookbook,jonDowdle/ossec-cookbook,controlshift/ossec-cookbook