[TASK] Add recipe code explanations and relevant variable name

recipes/default.rb

@@ -275,24 +275,25 @@ end
 # 	source 'rootCA.srl'
 # end
 
-additional_aliases = ''
+# concatenate the additional optional domains in order to avoid missing index exceptions
+additional_domains = ''
 if node.include?('xhprof') && node['xhprof'].include?('hostname')
-	additional_aliases = additional_aliases + ' ' + node['xhprof']['hostname']
+	additional_domains = additional_domains + ' ' + node['xhprof']['hostname']
 end
 
 if node.include?('webgrind') && node['webgrind'].include?('hostname')
-	additional_aliases = additional_aliases + ' ' + node['webgrind']['hostname']
+	additional_domains = additional_domains + ' ' + node['webgrind']['hostname']
 end
 
 if node.include?('mailhog') && node['mailhog'].include?('hostname')
-	additional_aliases = additional_aliases + ' ' + node['mailhog']['hostname']
+	additional_domains = additional_domains + ' ' + node['mailhog']['hostname']
 end
 
 bash 'Create Certificate' do
 	cwd '/etc/apache2/ssl/'
 	code <<-EOF
 		chmod 755 create_certificate_for_domain.sh
-		./create_certificate_for_domain.sh #{node['typo3_site']['hostname']} #{node['typo3_site']['server_aliases']}#{additional_aliases}
+		./create_certificate_for_domain.sh #{node['typo3_site']['hostname']} #{node['typo3_site']['server_aliases']}#{additional_domains}
 	EOF
 	action :run
 end