Block Canvas: Add self-closing tag to comments pattern in page template (#6764)

* Add closing tag to comments pattern

* Indent page template markup

block-canvas/templates/page.html

@@ -2,15 +2,14 @@
 
 <!-- wp:group {"layout":{"type":"constrained"}} -->
 <div class="wp-block-group">
-<!-- wp:post-title /-->
+    <!-- wp:post-title /-->
 </div>
 <!-- /wp:group -->
 
 <!-- wp:group {"tagName":"main","lock":{"move":false,"remove":true}} -->
 <main class="wp-block-group">
-<!-- wp:post-featured-image {"align":"full"} /-->
-
-<!-- wp:post-content {"layout":{"type":"constrained"},"lock":{"move":false,"remove":true}} /-->
+    <!-- wp:post-featured-image {"align":"full"} /-->
+    <!-- wp:post-content {"layout":{"type":"constrained"},"lock":{"move":false,"remove":true}} /-->
 </main>
 <!-- /wp:group -->
 
@@ -19,7 +18,7 @@
     <!-- wp:spacer {"height":60} -->
     <div style="height:60px" aria-hidden="true" class="wp-block-spacer"></div>
     <!-- /wp:spacer -->
-    <!-- wp:pattern {"slug":"block-canvas/comments"} -->
+    <!-- wp:pattern {"slug":"block-canvas/comments"} /-->
 </div>
 <!-- /wp:group -->