Update docs/classic-ui/theming/diazo.md

Co-authored-by: Copilot <[email protected]>

Author: thet

docs/classic-ui/theming/diazo.md

@@ -184,7 +184,7 @@ You can disable AJAX requests for Diazo themes with the help of the `ajax_load`
 This parameter is used in some places throughout Plone to indicate AJAX requests, which normally should not be transformed by Diazo.
 Also, in Plone 6.2 the `ajax_load` parameter will [automatically be added to the request](https://github.com/plone/Products.CMFPlone/pull/4169) for all AJAX requests.
 
-Firs you need a theme-parameter in your {file}`manifest.cfg` file.
+First you need a theme-parameter in your {file}`manifest.cfg` file.
 
 ```cfg
 [theme:parameters]