Small update doc test

core/DataTable/Filter/AddColumnsProcessedMetrics.php

@@ -16,8 +16,9 @@ use Piwik\DataTable;
 use Piwik\Metrics;
 
 /**
- * Adds the following columns to a DataTable using metrics that already exist:
- * 
+ * Adds the processed metrics columns to a DataTable using metrics that already exist.
+ *
+ * Columns processed are:
  * - **conversion_rate**: percent value of `nb_conversions / nb_visits
  * - **nb_actions_per_visit**: `nb_actions / nb_visits`
  * - **avg_time_on_site**: in number of seconds, `round(visit_length / nb_visits)`. not

core/DataTable/Filter/AddColumnsProcessedMetricsGoal.php

@@ -17,8 +17,9 @@ use Piwik\Piwik;
 use Piwik\Tracker\GoalManager;
 
 /**
- * Adds the following columns to a DataTable using metrics that already exist:
- * 
+ * Adds the Goal related metrics to a DataTable using metrics that already exist.
+ *
+ * Metrics added are:
  * - **revenue_per_visit**: total goal and ecommerce revenue / nb_visits
  * - **goal_%idGoal%_conversion_rate**: the conversion rate. There will be one of
  *                                      these columns for each goal that exists