Remove type attribute from front matter

This is not used on the current docs website
and needs to be removed for future compatibility
with Hugo.

Author: Sarah German

doc/settings/ssl/ssl_troubleshooting.md

@@ -2,7 +2,6 @@
 stage: Systems
 group: Distribution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
-type: reference
 ---
 
 # Troubleshooting SSL **(FREE SELF)**