Issue #2945513 by jpoesen, johnnny, Meenakshi.g, idebr, nno: Variable comment_parent in comment.html.twig should be parent_comment

core/modules/comment/templates/comment.html.twig

@@ -45,7 +45,7 @@
  *
  * These variables are provided to give context about the parent comment (if
  * any):
- * - comment_parent: Full parent comment entity (if any).
+ * - parent_comment: Full parent comment entity (if any).
  * - parent_author: Equivalent to author for the parent comment.
  * - parent_created: Equivalent to created for the parent comment.
  * - parent_changed: Equivalent to changed for the parent comment.

core/themes/bartik/templates/comment.html.twig

@@ -45,7 +45,7 @@
  *
  * These variables are provided to give context about the parent comment (if
  * any):
- * - comment_parent: Full parent comment entity (if any).
+ * - parent_comment: Full parent comment entity (if any).
  * - parent_author: Equivalent to author for the parent comment.
  * - parent_created: Equivalent to created for the parent comment.
  * - parent_changed: Equivalent to changed for the parent comment.

core/themes/classy/templates/content/comment.html.twig

@@ -45,7 +45,7 @@
  *
  * These variables are provided to give context about the parent comment (if
  * any):
- * - comment_parent: Full parent comment entity (if any).
+ * - parent_comment: Full parent comment entity (if any).
  * - parent_author: Equivalent to author for the parent comment.
  * - parent_created: Equivalent to created for the parent comment.
  * - parent_changed: Equivalent to changed for the parent comment.

core/themes/stable/templates/content/comment.html.twig

@@ -45,7 +45,7 @@
  *
  * These variables are provided to give context about the parent comment (if
  * any):
- * - comment_parent: Full parent comment entity (if any).
+ * - parent_comment: Full parent comment entity (if any).
  * - parent_author: Equivalent to author for the parent comment.
  * - parent_created: Equivalent to created for the parent comment.
  * - parent_changed: Equivalent to changed for the parent comment.