fix typo in usage note

Author: aptalca

ansible/roles/documentation/templates/README_SNIPPETS/USAGE.j2

@@ -2,7 +2,7 @@
 
 To help you get started creating a container from this image you can either use docker-compose or the docker cli.
 
-{{ "Unless a parameter is flaged as 'optional', it is *mandatory* and a value must be provided." | admonition(flavour=markdown, severity="info") }}
+{{ "Unless a parameter is flagged as 'optional', it is *mandatory* and a value must be provided." | admonition(flavour=markdown, severity="info") }}
 
 ### docker-compose (recommended, [click here for more info]({{ lsio_docs_url }}/general/docker-compose))