(chore): consistent capitalization for Pro (not PRO)

Core/Analytics/Dashboards/EarningsDashboard.php

@@ -95,7 +95,7 @@ class EarningsDashboard implements DashboardInterface
         return [
             'category' => 'earnings',
             'label' => 'Pro Earnings',
-            'description' => 'Earnings for PRO members will be paid out within 30 days upon reaching a minumum balance of $100.00.',
+            'description' => 'Earnings for Pro members will be paid out within 30 days upon reaching a minumum balance of $100.00.',
             'timespan' => $this->timespansCollection->getSelected()->getId(),
             'timespans' => $this->timespansCollection->export(),
             'metric' => $this->metricsCollection->getSelected()->getId(),