Fix typo in config comment (mmistakes#2243)

_config.yml

@@ -250,8 +250,8 @@ whitelist:
 #  - Archive page should exist at path when using Liquid method or you can
 #    expect broken links (especially with breadcrumbs enabled)
 #  - <base_path>/tags/my-awesome-tag/index.html ~> path: /tags/
-#  - <base_path/categories/my-awesome-category/index.html ~> path: /categories/
-#  - <base_path/my-awesome-category/index.html ~> path: /
+#  - <base_path>/categories/my-awesome-category/index.html ~> path: /categories/
+#  - <base_path>/my-awesome-category/index.html ~> path: /
 category_archive:
   type: liquid
   path: /categories/