[docs] Fix spelling lint failure in AI placements doc

Author: mickhawkins

docs/apis/plugintypes/ai/placement.md

@@ -109,7 +109,9 @@ The following is the typical structure of a Placement plugin, using the Editor P
 ## Settings
 
 Settings for the Placement should be defined in the `settings.php` file.
+<!-- cspell:disable -->
 Each Placement plugin should create a new admin settings page using `core_ai\admin\admin_settingspage_provider` class.
+<!-- cspell:enable -->
 
 This is the same as for Provider plugins, for example: