Merge branch 'docs-fix-table-api-settings' into 'master'

Docs: fix table on API settings

Closes gitlab-com/gitlab-docs#234

See merge request gitlab-org/gitlab-ce!22083

doc/api/settings.md

+---
+table_display_block: true
+---
+
 # Application settings API
 
 These API calls allow you to read and modify GitLab instance