add app key configuration

Author: kaitlinnewson

admin-guide/en/deploy.md

@@ -61,6 +61,12 @@ Set the `require_validation` in order to require new users to validate their ema
 require_validation = On
 ```
 
+During the installation process, the `app_key` should be set automatically. If the key is missing, there is a command-line tool that can be used to generate it:
+
+```bash
+php lib/pkp/tools/appKey.php
+```
+
 ## Secure Files Directory
 
 Every installation needs to have a secure files directory to ensure that private files, like unpublished submissions, can not be accessed by unauthorized users.

admin-guide/en/getting-started.md

@@ -65,7 +65,7 @@ Complete the form to finish the installation, using the file uploads directory t
 
 ![Screenshot of the install complete screen of OJS](./assets/install-complete.png)
 
-Once you have finished the install, login with the administrator account you set up to access the admin area. Depending on whether you installed OJS, OMP or OPS, you will be taken to a screen where you can create your first journal, press or preprint server.
+Once you have finished the installation, login with the administrator account you set up to access the admin area. Depending on whether you installed OJS, OMP or OPS, you will be taken to a screen where you can create your first journal, press or preprint server.
 
 - In OJS, click the **Add Journal** button.
 - In OMP, click the **Add Press** button.