corrected namespace in event class

src/Event/SolrDocumentAlterSubscriber.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\my_module;
+namespace Drupal\roblib_alter_solr;
 
 use Drupal\search_api\IndexInterface;
 use Drupal\search_api\Item\ItemInterface;
@@ -30,7 +30,7 @@ class SolrDocumentAlterSubscriber implements EventSubscriberInterface {
     $solrDocument = $event->getSolrDocument();
     $item = $event->getItem();
     $index = $event->getIndex();
-    
+
     if ($item->hasField('field_geo_area_name')) {
       $value = $item->getField('field_geo_area_name')->getValue();
       $solrDocument->addField('dc.coverage', $value);