Add page-inset to table of column options

Author: cwickham

docs/authoring/article-layout.qmd

@@ -418,7 +418,8 @@ Here are all of the available column specifiers:
 |              |     column: body-outset-left    |     .column-body-outset-left    |
 |              |     column: body-outset-right   |     .column-body-outset-right   |
 +--------------+---------------------------------+---------------------------------+
-| Page Inset   |     column: page-inset-left     |     .column-page-inset-left     |
+| Page Inset   |     column: page-inset          |     .column-page-inset-left     |
+|              |     column: page-inset-left     |     .column-page-inset-left     |
 |              |     column: page-inset-right    |     .column-page-inset-right    |
 +--------------+---------------------------------+---------------------------------+
 | Page         |     column: page                |     .column-page                |