Document php-fpm pools usage and link to resource docs
Document php-fpm pools usage and link to resource docs

Fixes #87.

netors/puppet-php,mmoll/puppet-php,NickelMedia/puppet-php,cgalvarez/puppet-php,netors/puppet-php,mayflower/puppet-php,glorpen/puppet-php,mmoll/puppet-php,cgalvarez/puppet-php,NickelMedia/puppet-php,mayflower/puppet-php,glorpen/puppet-php