Fix typo

Author: segfault3

docs/extension.rst

@@ -23,7 +23,7 @@ applications, please see the corresponding flatpak or build
 manifest.
 
 ``.Debug, .Locale, .Sources`` extensions created by Flatpak builder do
-not need to be specified manually. These are automaitcally created and
+not need to be specified manually. These are automatically created and
 loaded if installed.
 
 Note that, ``.Locale`` extensions are by default only partially