Merge pull request #8710 from Dren7755/Dren7755-ui-htmlcontent-escaper

Change escaping from block to escaper in HtmlContent component page

Author: dobooth

src/guides/v2.3/ui_comp_guide/components/ui-htmlcontent.md

@@ -72,11 +72,11 @@ Template `Vendor/Module/view/adminhtml/templates/template.phtml`:
 
 ```php
 <?php
-/** @var Magento\Backend\Block\Template $block */
+/** @var \Magento\Framework\Escaper $escaper */
 ?>
 
 <div>
-    <b><?= $block->escapeHtml(__('Custom template.')); ?></b>
+    <b><?= $escaper->escapeHtml(__('Custom template.')); ?></b>
 </div>
 ```