Fixed all occurrences of typo "Additionnal" (including file name)
---
-# Additionnal page configuration
+# Additional page configuration
-# Additionnal configurations are loaded using its file name, minus the extension, as an anchor (https://<mydashboad>#<config>).
+# Additional configurations are loaded using its file name, minus the extension, as an anchor (https://<mydashboad>#<config>).
# `config.yml` is still used as a base configuration, and all values here will overwrite it, so you don't have to re-defined everything