Add whitespace for list so it renders

doc/development/documentation/styleguide.md

@@ -652,6 +652,7 @@ keyword "only":
 - For GitLab Ultimate: `**[ULTIMATE ONLY]**`.
 
 For GitLab.com only tiers (when the feature is not available for self-hosted instances):
+
 - For GitLab Bronze and higher tiers: `**[BRONZE ONLY]**`.
 - For GitLab Silver and higher tiers: `**[SILVER ONLY]**`.
 - For GitLab Gold: `**[GOLD ONLY]**`.