[CI-SKIP] Add newlines in templates for readability

GitHub still just dumps people into an editor. It's not quite the forms
we hoped for. Better to add newlines and hope it makes things even a
tiny bit clearer for people reporting issues.

.github/ISSUE_TEMPLATE/performance-problem.md

@@ -15,6 +15,7 @@ ___All plugins running on the server___
 
 ### bukkit.yml, spigot.yml, paper.yml, server.properties
 ___Gist/pastebin/hastebin links___
+
 ### Other helpful links
 ___The more information we receive, the quicker and more effective we can be at finding the solution to the
 issue.___