Typo

Author: dbitouze

docs/install/manage-add-ons-packages.md

@@ -171,7 +171,7 @@ This example uses [`collective.easyform`](https://pypi.org/project/collective.ea
 collective.easyform
 ```
 
-Add it to {file}`instance.yml` to let Zope know that this add-on should be loaded:
+Add it to {file}`instance.yaml` to let Zope know that this add-on should be loaded:
 
 ```{code-block} yaml
 :emphasize-lines: 3-6