corrected typo

Author: homerr

readme-vars.yml

@@ -52,7 +52,7 @@ app_setup_block: |
   **The default username and password after initial configuration is admin/password**
 
   ## Power users
-  The container can configure itself using environment variables, the gaurd for this logic to run is if the variable `DB_TYPE` is set. The most common variables to set are a URL for the application and a database endpoint. IE:
+  The container can configure itself using environment variables, the guard for this logic to run is if the variable `DB_TYPE` is set. The most common variables to set are a URL for the application and a database endpoint. IE:
   * -e DB_TYPE=mysql
   * -e DB_HOST=host
   * -e DB_USER=user