Syntax help can only be seen after you have opened a template.
It would be better if there was a button on the main template window

under templates >

Version-Release number of selected component (if applicable):
Red Hat Satellite (build: 6.4.0)
foreman-1.18.0.0.3-1.el7sat.noarch

Steps to Reproduce:
1. your_satellite_FQDN/templates/provisioning_templates/10-Alterator default/edit
2. select Help tab
3.

Actual results:

Syntax help can only be seen after you have opened a template.

Expected results:

Syntax help is generic and not template specific so should be accessible before opening a template