Add tip text for multiple words search

src/Plugin/HmDisplayPlugin/HmDisplayJstree.php

@@ -44,7 +44,7 @@ class HmDisplayJstree extends HmDisplayPluginBase implements HmDisplayPluginInte
         '#type' => 'textfield',
         '#title' => $this
         ->t('Search'),
-        '#description' => $this->t('Type in the search keyword here to filter the tree below. Empty the keyword to reset the tree.'),
+        '#description' => $this->t('Type in the search keyword here to filter the tree below. Multiple keywords separated by spaces. Empty the keyword to reset the tree.'),
         '#attributes' => [
           'name' => 'jstree-search',
           'id' => isset($parent_id) ? 'hm-jstree-search-' . $parent_id : 'hm-jstree-search',