Fix typo

docs/dev/02_install_apps.rst

@@ -13,7 +13,7 @@ Installing a development environment for own apps
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 If you are developing your own app, you probably do not want to
-ru na development environment from the `AlekSIS-Core` repository.
+run a development environment from the `AlekSIS-Core` repository.
 
 Instead, simply install the environment using ``poetry install`` from
 your app repository – it will pull in `AlekSIS-Core` as a dependency