Description: Syntax error for journalbeat installation at setup command on user guide page.

Steps to reproduce:

1. Go to user guide link for journalbeat installation at:
   https://www.elastic.co/guide/en/beats/journalbeat/current/journalbeat-installation-configuration.html
2. Scroll down to step 4.
3. Observe forward slash is provided under linux tab for setup command.

Expected result:
Backward slash should be provided under linux tab for setup command.

Screenshot: