Updating descriptions for sections and blocks

src/EventSubscriber/LayoutBuilderIdsConfigureBlock.php

@@ -45,7 +45,7 @@ class LayoutBuilderIdsConfigureBlock implements EventSubscriberInterface {
         '#title' => 'Block ID',
         '#weight' => 0,
         '#default_value' => $layout_builder_id ? $layout_builder_id : NULL,
-        '#description' => t('Enter an ID for the section, must contain only letters and hyphens.'),
+        '#description' => t('Enter an ID for the block. IDs can contain letters, numbers, underscore, hyphen and period characters, and should start with a letter.'),
       ];
 
       // Add our custom submit function.

src/EventSubscriber/LayoutBuilderIdsConfigureSection.php

@@ -44,7 +44,7 @@ class LayoutBuilderIdsConfigureSection implements EventSubscriberInterface {
         '#title' => 'Section ID',
         '#weight' => 0,
         '#default_value' => isset($config['layout_builder_id']) ? $config['layout_builder_id'] : '',
-        '#description' => t('Enter an ID for the section, must contain only letters and hyphens.'),
+        '#description' => t('Enter an ID for the section.  IDs can contain letters, numbers, underscore, hyphen and period characters, and should start with a letter.'),
       ];
 
       // Add our custom submit handler.