Issue #3472822: add a description for checkbox/radio button widget in manage form display

Adds a summary of how Either checkbox or radio button is used in form display of component based on Allowed number of values

core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsButtonsWidget.php

@@ -13,6 +13,7 @@
 #[FieldWidget(
   id: 'options_buttons',
   label: new TranslatableMarkup('Check boxes/radio buttons'),
+  description: new TranslatableMarkup('This widget uses radio buttons if the "Allowed number of values" is set to 1. If the number of allowed values is more than 1 or unlimited, checkboxes will be used.'),
   field_types: [
     'boolean',
     'entity_reference',
@@ -68,4 +69,13 @@ protected function getEmptyLabel() {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary(): array {
+    $summary = [];
+    $summary[] = $this->t('This widget uses radio buttons if the "Allowed number of values" is set to 1. If the number of allowed values is more than 1 or unlimited, checkboxes will be used.');
+    return $summary;
+  }
+
 }